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Journal articles on the topic 'Epoxy Resin'
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1
Talango, Novriyanti, and Wawan Rauf. "ANALISIS KEKUATAN TARIK MATERIAL KOMPOSIT BERBAHAN SERAT BAMBU MAYAM." JURNAL SIMETRIK 13, no. 2 (2024): 729–33. http://dx.doi.org/10.31959/js.v13i2.1897.
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Penelitian ini bertujuan mengetahuai kekuatan tarik dari bahan komposit serat bambu mayan dengan matriks polyester resing dan epoxy resing, serta katalis sebagai matriks atau pengikat dari serat bambu mayan (gigatochloa robusta) dengan perbandingan resin 90% dan 10% serat bambu mayan serta 80% resin dan 20% serat bambu mayan. Hasil Pengujian menunjukan kuat tarik komposit serat bambu mayan dengan perbandingan resin epoxy dan serat bambu 90:10 memiliki nilai rata-rata 44.79 N/mm2, sedangkan pada perbandingan 80:20 memiliki nilai rata-rata sebesar 50.01 N/mm2.. Hasil uji tarik dengan perbandingan 90:10 resin polyester dan serat bambu memiliki nilai rata-rata 51.3 N/mm2 dan pada perbandingan 80:20 memiliki nilai rata-rata sebesar 82.29 N/mm2. Perbedaan hasil tegangan dan regangan pada nilai rata-rata kuat tarik karena dua resin yang digunakan memiliki densitas dan sifat yang berbeda. pencampuran resin epoxy dan hardener perbandingan 3:1 dengan grade viksikositas encer menghasilkan sifat yang ulet. Pencampuran resin polyester 450 gr dan jumlah katalis 3 tetes dengan grade viksikositas kental menghasilkan sifat yang getas.
2
Hoshi, Ikuo. "Phenol-formaldehyde resin/epoxy resin." Kobunshi 37, no. 11 (1988): 824–25. http://dx.doi.org/10.1295/kobunshi.37.824.
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Dong, Jin Hu. "Research of Fly Ash-Epoxy Resin Composite." Advanced Materials Research 450-451 (January 2012): 692–95. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.692.
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This article researched fly ash-epoxy resin composite properties and microstructure changing with the increase of epoxy resin content. The result show that, when the epoxy resin content increased to 30%, the tensile strength, rupture elongation and impact strength of composite increased to 329%, 168% and 257% respectively compare with the composite of epoxy resin content is 15%, and various properties change little with the epoxy resin content continuous increasing. And the composite formed 2μm or so and uniform distributed micro-pores when the epoxy resin content is 30% and the consistency of micro-pores increasing and some small micro-pores gathered into larger with the epoxy resin content increasing. Considering various properties, the fly ash-epoxy resin composite has the highest cost-effective when the epoxy resin content is 30 ~ 40%.
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Katogi, Hideaki, Kenichi Takemura, and Yoshinobu Shimamura. "Mechanical Properties of Carbon Fiber Reinforced Plastics under Hot-Wet Environment." Key Engineering Materials 462-463 (January 2011): 207–12. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.207.
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Water absorption behavior and flexural strength properties of carbon fiber reinforced plastics (CFRP) under hot-wet environment were examined. Those of epoxy resin were also examined for reference. Weight gains of CFRP and epoxy resin were measured after immersion in distilled water at temperatures under 90°C. Quasi-static flexural tests of CFRP and epoxy resin were conducted after immersion for 180 days. Weight gains of CFRP and epoxy resin increased with increasing water temperature. After immersion for 180 days at 90°C, weight gain of CFRP became 3.3times higher and that of epoxy resin was 2.3 times higher than that at RT, respectively. When CFRP and epoxy resin were immersed in distilled water at 90°C, weight gains of CFRP and epoxy resin increased and then decreased. Flexural strengths of CFRP and epoxy resin decreased in distilled water at temperatures less than 90°C. Flexural strengths of dried CFRP and epoxy resin after immersion recovered but were lower than that of virgin CFRP and epoxy resin. Debonding of fiber/resin interface and crack initiation in epoxy resin in distilled water resulted in the strength reduction.
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Kim, Hyoung-Sik, Song-Yi Yang, Eun Ha Choi, Kwang-Mahn Kim, and Jae-Sung Kwon. "Adhesion between Epoxy Resin-Based Fiber Post and Dental Core Resin Improved by Non-Thermal Atmospheric Pressure Plasma." Applied Sciences 10, no. 7 (2020): 2535. http://dx.doi.org/10.3390/app10072535.
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The purpose of the study was to evaluate the adhesion between dental core resin and epoxy resin-based fiber post after treatment with non-thermal atmospheric pressure plasma (NTAPP) and compare with conventional methods of epoxy resin-based fiber post treatments. Contact angle was measured on the surface of epoxy resin before and after NTAPP treatment and X-ray photoelectron spectroscopy was used to analyze the surface chemistry. Finally, two shear bond strength tests were carried out; shear bond strength between core resin and epoxy resin for comparison between NTAPP treated and untreated sample, and push-out shear bond strength between core resin and NTAPP treated commercially available epoxy resin-based fiber post for comparison between NTAPP treated samples with conventionally treated samples. Contact angle on the surface of epoxy resin generally decreased with increasing NTAPP treatment time with presence of surface chemical changes. Also, there was significantly higher shear bond strength and push-out shear bond strength between epoxy resin and core resin for NTAPP treated epoxy resin, even to the conventionally treated epoxy resin-based fiber post with hydrofluoric acid or silane. In conclusion, new technology of NTAPP has potential for application on the epoxy resin-based fiber post to improve endodontic restoration success rate.
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Cao, Jinling, and Ying Luo. "Study on tribological properties of epoxy resin composites." Journal of Physics: Conference Series 2256, no. 1 (2022): 012014. http://dx.doi.org/10.1088/1742-6596/2256/1/012014.
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Abstract Epoxy resin has been widely used in many fields. The improvement of friction and wear property can further expand the application range of epoxy resin. Filling modification can improve the tribological state of epoxy resin and improve the friction and wear property of epoxy resin. This paper summarizes the research of epoxy resin composite material tribology performance at the forefront of progress. The influence of different fillers on the friction and wear properties of epoxy resin composite materials was discussed from the aspects of the single filling of nano-filler, organic materials and inorganic lubricating fillers and the compound filling of inorganic or organic-inorganic fiber-filler. Many researching literature shows. The mechanical properties of epoxy resin composites are strengthened by adding filler to epoxy resin to improve the load bearing capacity of epoxy resin composites during friction. At the same time, add filler to reduce the surface of epoxy resin and the friction pair of duality between the caking property, and in the process of friction is easy to form transfer film, transfer film to isolate the direct contact of the friction surface, composite materials and the dual friction between surfaces into composite materials and transfer film, the friction between improved tribological condition between the friction pair, reduce the friction coefficient and wear rate of epoxy resin composites multiple fillers can improve the wear resistance and reduce the friction coefficient of epoxy resin composites, so that the epoxy resin composites have better tribological properties.
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Zhang, Xiao Yan. "Study on the Copolymer Properties of Phenolic Resin-Epoxy Resin." Key Engineering Materials 531-532 (December 2012): 73–78. http://dx.doi.org/10.4028/www.scientific.net/kem.531-532.73.
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The properties of phenolic-epoxy copolymer were studied in this paper. DSC was used to detect the possibility of copolymerization between phenolic resin and epoxy resin. FT-IR monitored the reactive process of mixed resin in various temperature stages. DMA revealed that the copolymer possessed high moduli and glass transition temperatures. The result showed that phenolic-epoxy copolymer can react in appropriate proportion. It is better for the copolymer system to avoid rich epoxy without curing agent. The properties of the copolymer could be increased when sacrificed some excellent properties of phenolic and epoxy. The copolymer 70% phenolic & 30% epoxy and 60% phenolic & 40% epoxy posses higher service temperature, lower volumetric shrinkage and excellent mechanical properties.
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Zhang, Lei, Wen Yan Liang, Ji Feng Zhang, and Fang Liu. "Performance of Modified Epoxy Resin by Inorganic Packing." Advanced Materials Research 383-390 (November 2011): 2790–93. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2790.
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We filled different proportions of inorganic packing(nano-silica) in the epoxy resin and investigated the flexural properties of modified epoxy resin compared with pure epoxy resin, based on the mechanics experiments using Zwick/Roell equipment. The experimental results showed the performance of modified epoxy resin by proper proportions of inorganic packing increased significantly compared with pure epoxy resin, but excessive inorganic packing had no help in improving the performance of epoxy resin and even cause some decline of the properties.
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Ma, Shao Bo, Zhao Xi, Gang Wang, Li Cheng, and Wei Zhang. "Study on Preparation of Novel Dicyclopentadiene Phenol Epoxy Resin Materials Based on Different Degrees of Polymerization." Key Engineering Materials 871 (January 2021): 222–27. http://dx.doi.org/10.4028/www.scientific.net/kem.871.222.
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This paper briefly describes the relevant properties of epoxy resin materials, and introduces the domestic and international progress of dicyclopentadiene (DCPD) phenolic epoxy resin. The process conditions of dicyclopentadiene phenol resin and epoxy resin were studied. Dicyclopentadiene phenol epoxy resin with different degrees of polymerization was prepared. The reaction heat was measured and the curing temperature, time and curing were analysed. The influence of factors such as the agent structure on the gel time and curing degree of DCPD phenol epoxy resin; the effects of temperature and time on the curing reaction of DCPD phenol epoxy resin were discussed.
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Xie, Yao, Qiu Feng Lü, Yan Qiao Jin, and Xian Su Cheng. "Enzymatic Hydrolysis Lignin Epoxy Resin Modified Asphalt." Advanced Materials Research 239-242 (May 2011): 3346–49. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.3346.
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This paper studies the modification of petroleum asphalt with enzymatic hydrolysis lignin (EHL) epoxy resin. EHL epoxy resin was successfully synthesized by EHL, a novel eco-material with high chemical reactivity. Different amounts of EHL epoxy resin were compounded into AH-70 paving asphalt. The effect of EHL epoxy resin on modified asphalt was examined by penetration, soften point, thin film oven test (TFOT), ductilily tests. The results showed that EHL epoxy resin had marked effect on the high-temperatrue property of increasing softening point at the content of 2-9wt% and it had significantly effect on the low-temperature properties and aging resistance with EHL epoxy resin content of 2-9wt% in modified asphalts. TG analysis indicated that EHL epoxy resin had the high mass loss temperature than pure asphalt. Anti-aging property of asphalt was improved by compounding EHL epoxy resin with asphalt.
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Pokonova, Yu V. "Resins and asphaltenes–modifiers for epoxy resin." Chemistry and Technology of Fuels and Oils 43, no. 2 (2007): 135–39. http://dx.doi.org/10.1007/s10553-007-0026-6.
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Vazquez Barreiro, E. C., F. Fraga Lopez, A. Jover, F. Meijide, E. Rodriguez, and J. Vazquez Tato. "Paramagnetic epoxy resin." Express Polymer Letters 11, no. 1 (2017): 60–72. http://dx.doi.org/10.3144/expresspolymlett.2017.7.
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WAKABAYASHI, Kazutami. "Epoxy Resin Adhesives." Journal of the Japan Society of Colour Material 87, no. 9 (2014): 332–37. http://dx.doi.org/10.4011/shikizai.87.332.
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ONIZUKA, Kenzo. "Epoxy Resin Hardener." Journal of The Adhesion Society of Japan 53, no. 4 (2017): 122–28. http://dx.doi.org/10.11618/adhesion.53.122.
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Yu, Yingfeng, Wenjun Gan, Xiaoyun Liu, and Shanjun Li. "Liquid crystalline epoxy resin modified cyanate ester/epoxy resin systems." Journal of Applied Polymer Science 109, no. 5 (2008): 2964–72. http://dx.doi.org/10.1002/app.28358.
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Sun, Jia Ying, Yan Qing Li, Wei Tian, and Cheng Yan Zhu. "Study on the Resin Curing Time and the Mechanical Properties of the Composites." Advanced Materials Research 602-604 (December 2012): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.33.
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In order to study the curing characteristics of common resins including bisphenol-A epoxy vinyl ester resin, phenolic epoxy vinyl ester resin and unsaturated polyester resin, the curing time of three resins was tested using cobalt naphthenate as accelerator and methyl ethyl ketone peroxide as curing agent. The results showed that the resin curing time reduces with the experimental temperature rising; in order to control the curing time at about 25 minutes when the experimental temperature is 23°C, the curing agent adding proportion of bisphenol-A epoxy vinyl ester resin, unsaturated polyester resin and phenolic epoxy vinyl ester resin are respective about 0.7%, 0.5% and 1.8%. The composites made by bisphenol-A epoxy vinyl ester resin have excellent tensile strength and composites made by phenolic epoxy vinyl ester resin have best bending strength.
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Wang, Sen, Yayun Lai, Yalan Yu, Mingwei Di, and Junyou Shi. "Effect of enzymatically hydrolyzed lignin on the curing characteristics of epoxy resin/polyamine blends." BioResources 12, no. 4 (2017): 7793–806. http://dx.doi.org/10.15376/biores.12.4.7793-7806.
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Corn stalk enzymatically hydrolyzed lignin (EHL) was used to modify bisphenol A-type epoxy resin. The curing reaction processes of the epoxy resin/polyamine blends and the lignin/epoxy resin/polyamine blends were studied via isothermal differential scanning calorimetry (DSC), and the effect of enzymatically hydrolyzed lignin on the curing reaction of epoxy resin was also analyzed. The results showed that the curing kinetics for two blends were not in full compliance with the autocatalytic curing kinetic model, especially the lignin/epoxy resin/polyamine blends. The apparent activation energy of the epoxy resin/polyamine blends increased with the increased presence of the lignin. The presence of enzymatically hydrolyzed lignin was beneficial to the curing process of epoxy resin/polyamine blends at high temperatures. The addition of the lignin increased the final curing reaction conversion rate, improved the glass transition temperature (Tg) and increased the bending strength for the epoxy resin/polyamine blends. However, the impact strength decreased in this process.
18
Kiattipornpithak, Krittameth, Pornchai Rachtanapun, Sarinthip Thanakkasaranee, et al. "Bamboo Pulp Toughening Poly (Lactic Acid) Composite Using Reactive Epoxy Resin." Polymers 15, no. 18 (2023): 3789. http://dx.doi.org/10.3390/polym15183789.
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A novel poly (lactic acid) (PLA) composite with excellent mechanical properties, toughness, thermal stability, and water resistance was developed using a reactive melt-blending technique. PLA was melt mixed with epoxy resin (EPOXY) and bamboo pulp (PULP) to improve its reaction and mechanical properties. FTIR analysis confirmed the successful reaction of the PLA/EPOXY/PULP composites; the epoxy groups of EPOXY reacted with the –COOH groups of PLA and the –OH groups of PULP. The PLA/EPOXY/PULP5 composite showed a high tensile strength (67 MPa) and high toughness of 762 folding cycles, whereas the highest tensile strength was 77 MPa in the PLA/EPOXY5/PULP20 sample. SEM images presented a gap between the PLA and PULP; gap size decreased with the addition of EPOXY. The Tg of the PLA decreased with the EPOXY plasticizer effect, whereas the Tm did not significantly change. PULP induced crystallinity and increased Vicat softening of the PLA/PULP and PLA/EPOXY/PULP composites. The EPOXY reaction of the PLA/PULP composites improved their tensile properties, toughness, thermal stability, and water resistance.
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Yin, Quan Fu, and Ming Wei Di. "Preparation and Mechanical Properties of Lignin/Epoxy Resin Composites." Advanced Materials Research 482-484 (February 2012): 1959–62. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1959.
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Lignin/epoxy resin composites were prepared by blending lignin with epoxy resin cured by polyamide. The effect of the content of lignin and polyamide on the mechanical properties of the lignin/epoxy resin composites was studied systemically. And the structure for the blend of lignin and epoxy resin without the curing agent was characterized by Fourier transform infrared spectroscopy (FTIR). The results of mechanical properties test showed that the bending strength of the composites decreases gradually with increasing the content of lignin, while the impact strength increased firstly and then decreased. The bending strength of lignin/epoxy resin composites showed a trend of increasing firstly and then decreasing with the increase of the content of polyamide, while the impact strength exhibited an opposite trend. The density for the composites increased with the addition of lignin, and polyamide exhibited an inconspicuous effect on density of the composites. The FTIR analysis results showed that the epoxy resin could be cured by lignin without polyamide, which concluded that the lignin could catalyze the cross-linking of epoxy resin or react with epoxy resin, and this bonding effect would beneficial to the properties of lignin/epoxy resin composites.
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Raj, Mahendrasinh, Jaykumar Maheta, and Lata Raj. "Synthesis characterization and application of hexafunctional epoxy resin and comparison against commercial epoxy resin." Polymers and Polymer Composites 30 (January 2022): 096739112210767. http://dx.doi.org/10.1177/09673911221076721.
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Current study compares the various analytical results of hexafunctional epoxy resins based on bisphenol-A with conventional epoxy resins. Reaction of bisphenol-A, formaldehyde, and epichlorohydrin produces hexafunctional epoxy resin. The curing properties of commercial epoxy resin and hexafunctional epoxy resin were determined using a variety of hardeners, including diethylenetriamine, triethylenetetramine, phenalkamine, polyamido amines, and polyamides. The epoxy equivalent weight (EEW), hydrolyzable chlorine content, volatile content, Brookfield viscosity, weight average molecular weight, elemental analysis (C, H, N, O analysis), and Fourier transform infrared spectroscopy were used to characterize the hexafunctional resin (FT-IR). Jute and glass reinforced composites were also prepared by using hexafunctional epoxy resins and commercial epoxy resins. Mechanical properties (tensile strength, flexural strength, Izod impact strength, and Rockwell hardness), thermal properties, and chemical resistance were determined for each composite. Hexafunctional epoxy resin-based composites exhibited superior mechanical characteristics, thermal resistance, and chemical resistance properties than commercial epoxy resin-based composites.
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Cheng, Rong, Cheng Zhang, and Jing Wang. "Preparation and Characterization of Epoxy Resin Composite Modified by Flexible Polyurethane Resin." Advanced Materials Research 904 (March 2014): 170–72. http://dx.doi.org/10.4028/www.scientific.net/amr.904.170.
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In this paper, under the effect of MD1041 cashew oil modified phenolic amine curing agent for epoxy resin, it successfully prepared polyurethane flexible resin modified epoxy resin composite materials by using polyurethane modified epoxy resin reinforced flexible resin. Modified composite material of the new preparation is characteristed by the method of the mechanical performance test, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC). The results show that the flexible resin has a strong effect on the toughness of modified epoxy resin composite materials. When the mass ratio of the flexible resin account for 5.9%,comprehensive mechanical properties of the modified composites is at the premium; when the mass ratio of flexible resin account for 3.1%, the thermal stability of the epoxy resin modified with flexible resin is at the best.
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Jianwen, Zhou, Yi Rongjun, and Wang Hong. "Practical Technology of Toughening Epoxy Resin (II): Modification Effects of Special Engineering Plastics on Epoxy Resin." American Journal of Materials Synthesis and Processing 9, no. 1 (2024): 10–22. http://dx.doi.org/10.11648/j.ajmsp.20240901.12.
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The effects of Special engineering plastics (SEP) such as polyether ether ketone (PEEK), polyimide (PI), thermoplastic polyimide (TPI), polyphenylene sulfide (PPS), polysulfone (PSF), liquid crystal polymer (LCP), polyaromatic (PAR) on the mechanical, thermal and electrical properties of epoxy resins were studied in this paper. The engineering plastics with rigid and active elements produce differential phase in the epoxy curing process, which can absorb energy under stress, prevent micro-crack diffusion, and improve the mechanical properties of epoxy resin, including tensile, compression and impact strength. SEP with better heat resistance than epoxy resins are beneficial for improving the heat resistance of epoxy resins. During the epoxy curing process, strong intermolecular forces are generated between SEP and epoxy resin, which further enhances the heat resistance of modified epoxy resins. Better insulation of epoxy resin are achieved by adding engineering plastics with fine insulation equipment. PSF with poor dispersion aggregates to form a weak interface layer, which first fails under stress, and its main mechanical properties slightly decrease. The dispersion of pulp like LCP in epoxy resin is poor, and there is no significant improvement in the mechanical properties of epoxy resin. PAR are difficult to form a homogeneous phase in epoxy resin and cannot be used for epoxy resin modification research.
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Lin, Qin, Zhen Jiang Song, and Jian Liang Xie. "Study on Thermal Stability Properties of Epoxy Matrix/Fluorine and Silicon Composites." Applied Mechanics and Materials 670-671 (October 2014): 143–47. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.143.
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Fluorine and silicon resin has excellent thermal stability properties. The thermal stability properties of polymers modified by fluorine and silicon resin can be improved. In this paper, fluorine and silicon resin has been prepared by (1,3,5-tris(trifluoropropylmethyl)-cyclotrisiloxane and 3-aminopropyltriethoxysilane. The FTIR spectra and the 1H NMR spectrum showed the structure of fluorine silicon resin. The thermo gravimetric traces indicated that fluorine silicon resin had improved the thermal stability properties of epoxy matrix resin significantly. The temperature of decomposition velocity of unmodified epoxy matrix resin and modified epoxy matrix resin began to increase rapidly were 356oC, 375oC respectively. The final weight fraction of unmodified epoxy matrix resin and modified epoxy matrix resin were 4.6%, 6.5% , respectively. The temperature of the maximum rate of degradation were 398oC, 420oC, respectively.
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Zhang, Xuanning, Hao Xu, Yanyu Liang, et al. "Molecular Simulation of Electron Traps in Epoxy Resin/Graphene Oxide Nanocomposites." Polymers 14, no. 19 (2022): 4208. http://dx.doi.org/10.3390/polym14194208.
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Trapped space charges in epoxy composite distort the electric field, which will induce the failure of the insulation system, and nano graphene oxide may inhibit the curing behavior of epoxy resin matrix. This paper analyzes how the two interfaces affect the electron traps of epoxy resin/graphene oxide systems with different nanofiller contents. The electron affinity energy of epoxy resin matrix and nano filler molecules in the epoxy resin/graphene oxide system is calculated based on quantum chemistry. It is found that nano graphene oxide has a strong electron affinity energy and is easier to capture electrons. Then the influence of the interface formed by the epoxy resin matrix and the nano graphene oxide on the electron transfer ability is calculated. The epoxy resin matrix contains the electron transfer ability of interfaces formed by nano graphene oxide and the molecular chain is different from that of unreacted molecules. The results can provide a reference for the modification of epoxy resin/graphene oxide nanocomposites.
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Li, Jiasheng, Yaoyang Zhu, and Jianying Yu. "Study on Physical Properties, Rheological Properties, and Self-Healing Properties of Epoxy Resin Modified Asphalt." Sustainability 15, no. 8 (2023): 6889. http://dx.doi.org/10.3390/su15086889.
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To investigate the effects of epoxy resin at low content on the physical properties, rheological properties, and self-healing properties of asphalt, epoxy asphalts with epoxy resin contents of 2%, 5%, 10%, and 20% were prepared. The distribution of epoxy asphalt (EA) in epoxy resin (ER) was quantitatively studied by fluorescence microscopy (FM) to investigate the feasibility of the preparation process. The glass transition temperature of epoxy asphalt was quantitatively analyzed by the differential thermal analyzer (DSC). The physical properties of epoxy asphalt were characterized by penetration test, ductility test, and softening point test. The rheological properties of epoxy asphalt were analyzed by the dynamic shear rheometer (DSR) to evaluate the self-healing properties of epoxy asphalt. The results show that the epoxy resin could be uniformly distributed in the asphalt, as verified by fluorescence microscopy (FM). With the increase in epoxy resin content, the glass transition temperature of epoxy asphalt gradually decreases, and the epoxy asphalt with 20% content shows the lowest glass transition temperature. At the same time, epoxy resin gives asphalt a higher modulus and high temperature performance, and the penetration and softening point of epoxy asphalt has also been greatly improved. On the contrary, the three-dimensional cross-linked grid structure, which is formed by epoxy resin and curing agent, reduces the rheological properties of epoxy asphalt and increases the elastic components of epoxy asphalt. Although the maltenes diagram still exhibits typical viscoelastic characteristic, the flow behavior index and flow activation energy of epoxy asphalt decreased.
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Wang, Fei, Hao Fu, Guixiang Liu, Chaohui Wang, and Sixin Yu. "Preparation Optimization and Performance Evaluation of Waterborne Epoxy Resin for Roads." Advances in Civil Engineering 2021 (September 17, 2021): 1–12. http://dx.doi.org/10.1155/2021/8977674.
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To further improve the road performance of waterborne epoxy resin, it was prepared by using the phase inversion method. The tensile properties, bending properties, impact resistance, and storage stability of waterborne epoxy resin were determined. The bonding properties of waterborne epoxy resin were analyzed. At the same time, their properties were compared with those of waterborne epoxy resin prepared by using the curing agent emulsification method. The performance of waterborne epoxy resin was comprehensively evaluated based on multi-index grey target decision model. The results show that the optimum preparation parameters for the preparation of waterborne epoxy resin by phase inversion method are shear time 1.5 h, shear temperature 60°C, and shear rate 1300–1500 r/min. The suitable contents of emulsifier A and B are 18% and 16%, respectively. The tensile strength, elongation at break, bending strength, bending deformation, and impact strength of waterborne epoxy resin prepared by emulsifier A can reach 34.46 MPa, 12.96%, 85.37 MPa, 19.42 mm, and 15.66 kJ/m2, respectively. It shows improved mechanical strength, deformation ability, impact resistance, and bonding performance. The comprehensive properties of waterborne epoxy resin prepared by emulsifier A are the best. It is suggested to use phase inversion method to prepare waterborne epoxy resin for roads.
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Yung, Tung-Yuan, Yu-Chun Lu, Jeng-Shiung Chen, Yu-Wei Cheng, Ting-Yu Liu, and Po-Tuan Chen. "Reinforcement of Epoxy Resin by Additives of Amine-Functionalized Graphene Nanosheets." Coatings 11, no. 1 (2020): 35. http://dx.doi.org/10.3390/coatings11010035.
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In this study, graphene oxide (GO) nanosheets were modified with an amine functional group to obtain amine-functionalized graphene (AMG) nanosheets and then blended with the aniline curing agent of bisphenol-A (BPA) epoxy resin to crosslink BPA epoxy resin. The AMG-blended curing agent and BPA epoxy resin formed an intermolecular hydrogen bond that was stronger than the π–π stacking force between benzene rings of graphene nanosheets. Therefore, AMG nanosheets exhibited excellent dispersion in the aniline curing agent. The amine group of AMG-blended curing agents and the epoxy functional group of BPA epoxy resin exhibited strong chemical activity and underwent crosslinking and polymerization. AMG nanosheets were mixed with BPA epoxy resin to form a crosslinked structure through the epoxy ring-opening polymerization of the resin. The mechanical properties of the epoxy resin nanocomposites were significantly improved by the added 1 wt.% AMG nanosheets. The tensile strength was enhanced by 98.1% by adding 1 wt.% AMG in epoxy. Furthermore, the impact resistance of the epoxy resin was enhanced by 124.4% after adding 2.67 wt.% of AMG nanosheets. Compared with other reinforced fillers, AMG nanosheets are very light and can therefore be used as nanocomposite materials in coating applications, the automotive industry, aerospace sheet materials, wind power generation, and other fields.
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Jin, Yu Jie, Xin Sheng Yin, and Li Guang Xiao. "Application of Epoxy Resin Concrete in Covers." Applied Mechanics and Materials 204-208 (October 2012): 3819–22. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3819.
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In this paper,it discusses the application of epoxy resin concrete,introduces the ultimate bearing capacity of covers of epoxy resin concrete and analysis of capacity theory and experiment result on covers of epoxy resin concrete.High performance polymer concrete is used to make the manhole cover instead of iron’s nowadays,and the paper analyzes the theory and test results of epoxy resin concrete,the performance of epoxy resin concrete is superior in fact,this kind of covers is the thinnest in all the covers.
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Sheng, Jian Guo, Ping Zeng, and Yu Di Shan. "Study on the Synthesis and Properties of Waterborne Epoxy Resin and Curing Agent." Advanced Materials Research 815 (October 2013): 547–51. http://dx.doi.org/10.4028/www.scientific.net/amr.815.547.
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With chemical modification method, the epoxy resin E44 was modified into water-borne epoxy resin by diethanolamine, considering the compatibility of curing agent and resin, diethylenetriamine was modified into epoxy amine curing agent as well, through single factor method to discuss the effects of reactant ratio, reaction temperature on the results of the product, the structure of the product was analyzed by Infrared spectrum. The experimental results showed that, when molar ratio of epoxy resin and diethanolamine was 4:3, reaction temperature of 70-80°C, the preparation of waterborne epoxy resin emulsion has small particle size and good stability. At the same time, when molar ratio of epoxy resin and diethylenetriamine was 1:1, reaction temperature of 80°C, the performance of waterborne epoxy curing agent is well.
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Han, Xu, Shuangyong Wang, Lei Huang, and Haibin Zhou. "Applicability Evaluation of Modified Epoxy Resin in the Repair and Reinforcement of Ancient Building Timber Members." Forests 15, no. 6 (2024): 933. http://dx.doi.org/10.3390/f15060933.
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To investigate the potential of modified epoxy resin for repairing and strengthening historical wooden structures, this study utilized polyurethane and silicone-modified epoxy resin as the base, alongside a polyamine curing agent. The resin mixture was cured at ambient temperature, resulting in the creation of ten unique epoxy resin systems. Investigation into the chemical structure and alterations to the glass transition temperature were conducted. The study conducted tests and characterization of viscosity, curing rate, mechanical properties, stress failure mode, hygrothermal aging resistance, and bonding properties. The results reveal that the curing degree of the two modified epoxy resins is high after being cured at room temperature, and the chemical structure and curing rate show insignificant changes. The range of the glass transition temperature for the modified epoxy resin is between 61.31 °C and 70.51 °C. The incorporation of polyurethane and silicone molecular chains into the epoxy resin cross-linking curing system enhances the toughness of the epoxy resin. The modified resin achieves a maximum elongation at break that is 5.18 times greater than that of the unmodified resin, along with a maximum tensile strength and a compressive strength that are 7.94 and 1.74 times, respectively, higher than those in the Chinese technical specifications for the maintenance and reinforcement of ancient wooden structures. The increase in toughness changes the failure mode of the cured epoxy resin. The modified epoxy resin exhibits great bonding ability to aged wood, with a shear strength of up to 9.6 MPa along the grain. As a result, the modified epoxy resin meets the requirements for the reinforcement and repair of the timber members of ancient buildings.
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Panthakkal Abdul Muthalif, Mohammed, and Youngson Choe. "Influence of Maleinized Polybutadiene on Adhesive Strength and Toughness of Epoxy Resins." International Journal of Polymer Science 2022 (December 28, 2022): 1–8. http://dx.doi.org/10.1155/2022/9517467.
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This study explored the effect of maleinized polybutadiene (MPB) on the mechanical properties of epoxy resins. Diglycidyl ether of bisphenol-A, an epoxy resin, was modified by incorporating MPB having different molecular weights in order to improve the fracture toughness and peel strength. MPB was mixed with epoxy resin at several concentrations (5, 10, and 15 phr), with the epoxy resin as the major phase and MPB as the minor phase. A comparative study was performed to investigate the influence of MPB on epoxy resins based on their molecular weight difference. Lap shear test results showed that the shear strength of the MPB-modified epoxy resins was superior to that of the neat epoxy resin. At 10 wt% MPB loading, the modified epoxy resin exhibited an 87% enhancement in T-peel strength relative to that of the neat epoxy resin. Moreover, the fracture energy of the modified epoxy system increased proportionally with the amount of MPB in the epoxy matrix. These results indicate that MPB incorporation is a simple and effective method for designing multifunctional epoxy resins, thus facilitating their industrial application in various spheres.
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Fang, Cheng, Dong Bo Guan, Wei Guo Yao, Shou Jun Wang, and Hui An. "Studies on Mechanical and Thermal Properties of Epoxy Resin Modified by Fluorine-Containing Silicone." Applied Mechanics and Materials 401-403 (September 2013): 713–16. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.713.
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The epoxy resin was modified with the mixture of α,ω-dihydroxy poly-(3,3,3-trifluoropropyl) siloxane (PTFPMS), KH560 and stannous octoate. KH560 can react with PTFPMS and also epoxy resin curing agent. The two reactions were characterized by FI-IR. The modified epoxy resin was characterized by FI-IR. The result showed that fluorine-containing silicone had been successfully introduced into the epoxy system. The mechanical and thermal properties of the modified epoxy resin were analyzed. The results showed that with the increase of PTFPMS the impact strength of epoxy resin increased, hardness and bending strength correspondingly reduced, slight decrease in the glass transition temperature.
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Song, Zhenjiang, Jianliang Xie, Peiheng Zhou, Jianing Peng, Xin Wang, and Longjiang Deng. "Thermal degradation of epoxy resin grafted with polyurethane." Science and Engineering of Composite Materials 21, no. 1 (2014): 7–13. http://dx.doi.org/10.1515/secm-2012-0170.
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AbstractEpoxy resin grafted with polyurethane was synthesized and characterized through a series of tests. The grafting reactive process between the pendant secondary hydroxyl groups on the side chains of epoxy resin and the isocyanate groups of pre-polyurethane were investigated by Fourier transform infrared spectroscopy. Thermal behavior of the grafted epoxy resin was investigated by thermogravimetric analysis within 40–500°C. The degradation of grafted epoxy resin involved two stages. Microstructures of the polyurethane section and grafted epoxy resin were observed by field emission scanning electron microscopy. Model fitting method was employed to calculate the thermal degradation model of grafted epoxy resin. In this paper, 15 typical kinetic mechanisms were introduced into the model fitting method, such as Coats-Redfern method and Achar-Brindley-Sharp-Wendworth method, to obtain the kinetic function of thermal degradation for grafted epoxy resin.
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Yin, Jicai, Yanli Teng, Xiaojun Meng, Yuanyuan Ge, and Xiuhong Zhang. "Influence of fly ash on the curing characteristics of an epoxy resin." Polymers and Polymer Composites 28, no. 8-9 (2019): 579–88. http://dx.doi.org/10.1177/0967391119894083.
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With excellent damping capacity, growing interest has been focused on polymer concrete (PC) as a novel machine tool bed material in the field of ultraprecision machining. It is widely acknowledged that the fly ash (FA) is an essential component material in reducing the curing shrinkage of PC, which can significantly affect the curing characteristic of PC. However, the effect of FA on the curing characteristic of epoxy resin is not studied in detail. In this article, the effect of FA on the curing characteristic of epoxy resin was examined by differential scanning calorimetry. Experimental results show that the peak temperature and curing rates of epoxy resin/curing agent and epoxy resin/curing agent/FA increase with the increasing heating rates, and the peak temperature and curing rates of epoxy resin/curing agent are greater than that of the epoxy resin/curing agent/FA with the same heating rates. In addition, the difference between the maximum curing rates of epoxy resin/curing agent and epoxy resin/curing agent/FA decreased with the increasing heating rates. This article can provide technical reference for curing process of PC for machine tool beds and further improve the machining accuracy.
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Novita, Arisia, Elvira Elvira, Eka Priadi, and Herwani Herwani. "THE EFFECT OF USING EPOXY RESIN VARIATIONS ON THE VALUE OF COMPRESSIVE STRENGTH, SPLIT STRENGTH, AND ELASTIC MODULUS OF POLYMER MORTARS USING RIVER SAND." Jurnal Teknik Sipil 24, no. 1 (2024): 857. http://dx.doi.org/10.26418/jts.v24i1.67500.
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The rapid development of physical and infrastructure projects in Indonesia necessitates efficient building materials. Mortar, a standard construction material comprising fine aggregate, water, and cement, has strength, environmental resistance, and flexibility limitations. This study investigates using epoxy resin as a substitute for cement in mortar production. Epoxy resin, a liquid material that hardens into a strong binder, offers potential benefits such as accelerated setting time and increased strength. The research uses river sand as the fine aggregate and varies the epoxy resin content from 5%, 10%, 15%, 20%, and 25% of the material volume. Tests will measure compressive strength, split tensile strength, and modulus of elasticity across different epoxy resin compositions. Results from Tanjung Pura University's Materials and Construction Laboratory in Pontianak indicate that adding epoxy resin significantly improves compressive strength (up to 35.92 MPa at 25% resin) and tensile strength (up to 3.82 MPa at 25% resin). However, adding epoxy resin leads to a decreased modulus of elasticity, indicating increased deformability. This research sheds light on epoxy resin's impact on mortar strength and informs potential applications in concrete repair and construction.
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Zheng, Xiaoguang, Yajie Chen, Wanwan Xu, Zhen Zhang, Guoqiang Sun, and Tao Wang. "Long-Term Performance Analysis of Epoxy Resin Ultra-Thin Wearing Course Overlay on Cement Concrete Pavement." Coatings 13, no. 8 (2023): 1455. http://dx.doi.org/10.3390/coatings13081455.
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The overall rigidity of the cement concrete pavement is high, but there are defects such as easy cracking and insufficient anti-slip performance. The epoxy resin ultra-thin wearing course overlay can effectively solve these issues. However, there is still a lack of knowledge about the long-term performance of epoxy resin ultra-thin wearing course overlay on cement concrete pavement. Therefore, this article analyzed the interlayer adhesion and durability of epoxy resin ultra-thin wearing course overlay through the Hamburg rutting test and a series of shear tests under damp heat, thermal oxygen aging, and ultraviolet (UV) aging conditions. Shear test results indicated that the shear performance of epoxy resin overlay grew with the increase in epoxy resin content and was severely affected by high temperature, and the optimal content was set as 3.4 kg/m2. The Hamburg rutting test results showed that the epoxy resin overlay exhibited satisfactory high-temperature performance and water resistance. For the damp heat effect, it was revealed that damp heat led to more significant shear strength loss compared with the overlay specimens without damp heat. The water immersion caused the shear strength decline due to the water damage to the overlay interface. As for the thermal oxygen aging effect, it was reflected that the short-term thermal oxygen aging had a minor impact on the shear performance of the epoxy resin overlay. However, with the increase in thermal oxygen aging duration, the shear strength of the epoxy resin overlay significantly decreased due to the aging of epoxy resin binders. Regarding the UV aging impact, it was also found that the shear performance of the epoxy resin overlay rapidly decreased as the UV aging duration grew whether at 20 °C or 60 °C. Moreover, UV aging led to a more significant impact on the shear performance of the epoxy resin overlay than thermal oxygen aging.
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Ji, Yuanhuo, Hui Qiao, Yun Liang, Guilong Xu, Yi Wang, and Jian Hu. "Preparation of water-based epoxy resin and its application as an automotive air filter paper binder." BioResources 14, no. 3 (2019): 7148–56. http://dx.doi.org/10.15376/biores.14.3.7148-7156.
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Water-based epoxy resin emulsion was prepared by emulsifying o-cresol formaldehyde epoxy resin with self-emulsified epoxy curing agent synthesized in this study and then used as an environmentally friendly binder for automotive air filter paper. The preparation process of the self-emulsified epoxy curing agent was confirmed by Fourier transform infrared spectroscopy (FTIR). The effects of neutralization degree (Neu) and amount of curing agent on the formation of epoxy resin emulsion were studied. The micro-morphology and size distribution of the epoxy resin latex were characterized by transmission electron microscopy (TEM) and dynamic and static light scattering, respectively. The micro-structure of the air filter paper surface was studied by scanning electron microscope (SEM). The mechanical strength and moisture-resistance properties of air filter strengthened by the prepared water-based epoxy resin emulsion was tested and compared to three commercial binders. The prepared epoxy resin emulsion greatly enhanced the mechanical properties and moisture-resistance properties of the air filter paper while maintaining its filtration properties. Therefore, the epoxy resin emulsion can be used as an environmentally friendly water-based binder for automotive air filter paper with excellent comprehensive properties.
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Zhao, Yixin, Rui Xu, Yao Xiao, Hailou Wang, Wei Zhang, and Guangyu Zhang. "Mechanical Performances of Phenolic Modified Epoxy Resins at Room and High Temperatures." Coatings 12, no. 5 (2022): 643. http://dx.doi.org/10.3390/coatings12050643.
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Epoxy is an important resin matrix and has been widely applied in laminated composites as a coating or adhesive material. In this article, the phenolic was applied to modify the mechanical properties of epoxy resin. The phenolic modified epoxy resins with various phenolic content were prepared via a polytetrafluoroethylene mould, and the phenolic modified epoxy-based plain woven laminated composites (PWLCs) were manufactured via vacuum assisted resin transfer method for further study of phenolic modified epoxy resins’ mechanical properties. The compression tests were performed perpendicularly to thickness at 2 mm/min to investigate the mechanical performances of phenolic modified epoxy resins and epoxy-based PWLCs. The results showed that the addition of phenolic into epoxy could improve the mechanical performances of epoxy resins and epoxy-based composites at room temperature, and the phenolic influenced epoxy-based PWLC more than epoxy matrix at room temperature. However, at high temperatures, the addition of phenolic decreased the mechanical performances of epoxy resins and epoxy-based composites, and the adverse effect of phenolic became more serious with the increase of phenolic content at high temperature. In addition, the thermogravimetric analyses were also conducted from 30 °C to 800 °C on phenolic modified epoxy resins and the results showed that the phenolic modified epoxy resin had an earlier loss in weight than unmodified epoxy resin. The earlier loss in weight meant that the addition of phenolic into epoxy resin led to the formation of unstable molecules at high temperature.
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Huang, Ruodong, Chao Gao, Fusheng Zhou, Jiahe Yu, and Hao Yang. "Mechanical properties analysis of cross-linked epoxy resin." Journal of Physics: Conference Series 2783, no. 1 (2024): 012054. http://dx.doi.org/10.1088/1742-6596/2783/1/012054.
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Abstract For this study, bisphenol A epoxy resin (DGEBA) was used as the resin matrix, and 3,3’-diaminodiphenyl sulfone (33DDS) was used as the curing agent. The effects of different cross-linking densities on the mechanical properties of epoxy resins were studied by molecular dynamics (MD) simulation, and the changes in the mechanical properties of epoxy resins under five different cross-linking density levels were predicted [1]. The results showed that as the cross-linking density of the epoxy resin increased, the mechanical parameters (such as elastic modulus, shear modulus, and bulk modulus) of the epoxy resin system also increased. This indicates the importance of improving the curing process of epoxy resin to enhance its mechanical properties.
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Lee, Deok Bo, Tae Won Kim, and Uoo Chang Chung. "Reliability Evaluation of Interfacial Shear Strength on Single Carbon-Fiber/Rubber-Modified Epoxy Resin System." Key Engineering Materials 297-300 (November 2005): 1784–89. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1784.
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Rubber-modified epoxy resins are used as a matrix material for glass and carbon-fiber composites. Mechanical properties of fiber reinforced composites depend on the interfacial shear strength between the reinforced fiber and the matrix resin. This study is focused on the interfacial shear strength in the reinforced carbon fiber and rubber-modified epoxy resin system. To evaluate interfacial shear strength between the fiber and the resin, pull-out test is performed using a microdroplet method. Based on experimental results, numerical analysis was also simulated. It is concluded that the interfacial shear strength of carbon fiber/unmodified epoxy resin system was higher than that of carbon fiber/modified epoxy resin system. The reason for decreased the interfacial shear strength of rubber-modified system is that contractive forces in neat epoxy resin acting on carbon fiber were less than those in rubber-modified epoxy resin system.
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Hasan Harun, Ervan, Randani Kurniawan Putra Otaya, and Jumiati Ilham. "PERBANDINGAN TEGANGAN TEMBUS DAN KUAT TEKAN ISOLATOR RESIN EPOKSI MENGGUNAKAN PASIR SUNGAI BOLANGO GORONTALO DAN PASIR SILIKA SEBAGAI FILLER." Journal Of Renewable Energy Engineering 1, no. 1 (2023): 1–5. http://dx.doi.org/10.56190/jree.v1i1.7.
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Salah satu masalah dalam penggunaan resin epoxy sebagai bahan dasar pembuatan isolator adalah harga resin epoksi yang masih relatif mahal dan susah didapatkan khususnya di daerah Gorontalo. Penelitian kali ini mencoba menambahkan pasir sungai Bolango Gorontalo dan pasir silika sebagai pengisi (filler) ke dalam bahan resin epoxy dengan variasi atau komposisi tertentu untuk kemudian dilakukan pengujian terhadap tegangan tembus dan kuat tekan. Metode experimen digunakan pada penelitian ini, yakni pengujian tegangan tembus menggunakan sumber tegangan tinggi AC dan pengujian kuat tekan menggunakan alat uji kuat tekan. Dari hasil penelitian didapatkan bahwa, isolator resin epoxy dengan penambahan pasir sungai sebagai filler memiliki ketahanan terhadap tegangan tembus yang kurang baik dibandingkan dengan isolator resin epoxy dengan filler berupa pasir silika. Namun, dari aspek kuat tekan, maka isolator resin epoxy dengan filler berupa pasir sungai memiliki nilai kuat tekan yang lebih tinggi dibandingkan dengan isolator resin epoxy dengan filler pasir silika.
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Duda, Monika, Joanna Pach, and Grzegorz Lesiuk. "Influence of Polyurea Composite Coating on Selected Mechanical Properties of AISI 304 Steel." Materials 12, no. 19 (2019): 3137. http://dx.doi.org/10.3390/ma12193137.
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This paper contains experimental results of mechanical testing of the AISI 304 steel with composite coatings. The main goal was to investigate the impact of the applied polyurea composite coating on selected mechanical properties: Adhesion, impact resistance, static behavior, and, finally, fatigue lifetime of notched specimens. In the paper the following configurations of coatings were tested: EP (epoxy resin), EP_GF (epoxy resin + glass fabric), EP_GF_HF (epoxy resin + glass fabric hemp fiber), EP_PUA (epoxy resin + polyurea) resin, EP_GF_PUA (epoxy resin + glass fabric + polyurea) resin, and EP_GF_HF_PUA (epoxy resin + glass fabric + hemp fiber + polyurea) resin. The highest value of force required to break adhesive bonds was observed for the EP_PUA coating, the smallest for the single EP coating. A tendency of polyurea to increase the adhesion of the coating to the base was noticed. The largest area of delamination during the impact test was observed for the EP_GF_HF coating and the smallest for the EP-coated sample. In all tested samples, observed delamination damage during the pull-off test was located between the coating and the metallic base of the sample.
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Zhang, Daohong, Demin Jia, and Xianbo Huang. "Bisphenol-A epoxy resin reinforced and toughened by hyperbranched epoxy resin." Frontiers of Chemical Engineering in China 1, no. 4 (2007): 349–54. http://dx.doi.org/10.1007/s11705-007-0063-z.
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Aslanova, E. T., S. Y. Heydarova, E. G. Iskenderova, and B. A. Mamedov. "New epoxy-imide resin." Perspektivnye Materialy 5 (2024): 48–55. http://dx.doi.org/10.30791/1028-978x-2024-5-48-55.
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By interaction of dipotassium salt of 2-hydroxypropyl-1,3-bis-carboxymethylesterimide of saccharin-6-carboxylic acid with epichlorohydrin, N,N’-diglycidyl-1,3-bis-carboxymethylestersulfoimide of 2-hydroxypropyl saccharin-6-carboxylic acid has been obtained. The structure of the obtained epoxy-imide compound has been confirmed by data of the IR spectroscopy. On the basis of the obtained resin the thermostable epoxy-imide composition of “hot” curing was made. For comparative estimation ofthe heat- resistance of the obtained oligomer, it has been also made the composition on the basis of epoxy- diane resin ED-20. The curing process of the composition was studied by a method of differential thermal analysis on derivatograph of Paulik-Paulik-Erdey system. It was found that the degree of curing of the obtained composition under the optimal hardening regime reaches 82 %. It has been established according to the received data that the composite material based on epoxy-imide resin is characterized by sufficiently high thermal indices in comparison with materialson the basis of the resin ED-20 and can replace them in those areas where heat-resistant epoxy compounds are needed and also be used to produce heat-resistant epoxy adhesives and coatings.
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Pan, Wenwu, Dandan Zhang, Ming Lu, Zhenbiao Li, Chao Gao, and Zhiyu Wan. "Study on the Morphology Characteristics of Epoxy Resin of Composite Insulator under Acid-heat Condition." Journal of Physics: Conference Series 2213, no. 1 (2022): 012010. http://dx.doi.org/10.1088/1742-6596/2213/1/012010.
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Abstract Whether epoxy resin is degraded or not in composite insulators is the most direct criterion to distinguish Decay-like fracture from brittle fracture and normally mechanical fracture. During the actual operation of composite insulators, the nitric acid produced by partial discharge and abnormal heating will accelerate the degradation and deterioration of epoxy resin of composite insulators. In this paper, the experimental platform under acid-heat condition is built by using heating furnace, grinding bottle and serpentine condensation tube, and the acid-heat deterioration experiments are carried out under 60 °C (3 mol/L and 5 mol/L) and 80 °C (3 mol/L and 5 mol/L) condition. The macroscopic and microscopic morphologies of epoxy resin after acid-heat deterioration are analyzed, and the morphology changes of epoxy resin under the influence of acid-heat coupling field are studied. Firstly, it is concluded that the epoxy resin changes directly from colorless to light yellow, and then from light yellow to dark yellow under the influence of acid-heat deterioration. In addition, in the early stage of deterioration, the bulge on the surface of epoxy resin decreases gradually. Meanwhile, the maximum height difference and standard deviation of the surface profile of epoxy resin also gradually decreases, and the roughness decreases. In the later stage of deterioration, cracks appear on the surface of epoxy resin and some epoxy resins fall off. At the same time, the maximum height difference and standard deviation of surface profile of epoxy resin increases.
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Huang, Jen Ching, and Tsung Ching Lin. "Study on Mechanical Properties of Multilayer Graphene/Epoxy Nanocomposites." Key Engineering Materials 846 (June 2020): 29–34. http://dx.doi.org/10.4028/www.scientific.net/kem.846.29.
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In this paper, the implementation and testing of multilayer graphene/epoxy resin nanocomposites are discussed. Firstly, the epoxy resin hardener is mixed with the multilayer graphene, and then mixed with the main agent, then poured into the mold, and the low temperature cooling system is used. The curing time of the epoxy resin is slowed down, and the bubble is removed before the complete hardening by the vacuum defoaming method, and the mechanical properties such as tensile strength and toughness are compared with the pure epoxy resin after being sufficiently hardened. In this paper, we investigated the effect of multilayer graphene content on mechanical properties by using the tensile test and impact test. We discussed the effect of multilayer graphene content on the coefficient of elasticity of the multilayer graphene/epoxy resin composites at different stretching rates. And the toughness of the multilayer graphene/epoxy resin composites was evaluated by impact test. After the experiment, it was found that the stretching rate has a certain degree of influence on the grapheme/epoxy resin composite material. And that the addition of 2% multilayer graphene to epoxy resin had the best effect and could effectively improve the coefficient of elasticity and toughness.
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Srisuwan, Sawitri, N. Prasoetsopha, Nitinat Suppakarn, and Pranee Chumsamrong. "Composite Materials Based on Natural Rubber Modified Epoxy Resin and Sisal Fiber." Advanced Materials Research 410 (November 2011): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.410.43.
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In the present work, bisphenol-A based epoxy resin was blended with methyl methacrylate (MMA)/glycidyl methacrylate (GMA) grafted depolymerized natural rubber (GDNR). GDNR/epoxy resin blend was composite with woven sisal fiber. GDNR was prepared by solution grafting MMA/GMA (90/10 w/w%) onto depolymerized natural rubber (DNR). The occurrence of GDNR was confirmed by proton nuclear magnetic resonance spectroscopy (1H-NMR). Amount of GDNR in the blend was 1 part per hundred resins. Impact strength of epoxy resin was increased by 62% when GDNR was added. Composites of GDNR/epoxy resin and woven sisal fiber were prepared by hand-lay up process. Amounts of woven sisal fiber in the composite were 3, 5 and 7% by weight (wt%). The flexural modulus of the composites was higher than that of neat epoxy resin and increased with increasing amount of woven sisal fiber. Nevertheless, flexural strength of all composites was lower than those of neat epoxy resin and the blend. Compared to neat epoxy resin, the impact strength of the composite containing 7 wt% woven sisal fiber was further increased to 114%.
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Qian, Yongmei, Zujie Li, Yujie Jin, and Ruozhu Wang. "Experimental Study on Axial Tension Members of a New Epoxy Resin Concrete." Science of Advanced Materials 13, no. 10 (2021): 2005–15. http://dx.doi.org/10.1166/sam.2021.4133.
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Epoxy resin concrete, as a new kind of polymer concrete, holds a good application prospect because of its excellent material properties, such as high strength, good crack resistance, and others. In this workr, the material tensile property and axial tensile member stress performance of epoxy resin concrete were studied via axial tensile experiments. Before experiments, the original set of drawing clamps on the tester was replaced with a customized steel plate clamps to suit the size of the tensile specimen. The results showed that epoxy resin concrete has better tensile strength and crack resistance compared with ordinary concrete, as well as material uniformity and good integrity. The relevance of the results reported in this work is that the mechanical property study on axial tension members of the new epoxy resin concrete allows improving the tensile failure mechanism and design theory basis of new epoxy resin concrete as structural members, which provides strong support for further study on the development of epoxy resin concrete. The cracking axial force of the epoxy resin concrete was 118 kN, which is 68.6% higher than the ordinary concrete.
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Bao, Xiaohui, Fangyi Wu, and Jiangbo Wang. "Thermal Degradation Behavior of Epoxy Resin Containing Modified Carbon Nanotubes." Polymers 13, no. 19 (2021): 3332. http://dx.doi.org/10.3390/polym13193332.
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Via the surface-grafting of carbon nanotubes (CNTs) with a silicon-containing flame retardant (PMDA), a novel flame retardant CNTs-PMDA was synthesized. The flame retardancy was tested by cone calorimeter. Compared with pure epoxy resin, the total heat release (THR) and peak heat release rate (PHRR) of epoxy resin containing CNTs-PMDA were significantly reduced, by 44.6% and 24.6%, respectively. Furthermore, thermal degradation behavior of epoxy resin based composite was studied by the thermogravimetric analysis with differences in heating rates. The kinetic parameters of the thermal degradation for epoxy resin composites were evaluated by the Kissinger method and Flynn-Wall-Ozawa method. The results suggested that activation energy values of epoxy resin containing CNTs-PMDA in thermal degradation process were higher than those of pure epoxy resin in the final stage of the thermal degradation process, which was closely related to the final formation of char layer residues. Finally, the results from Dynamic mechanical thermal analysis (DMTA) and Scanning electron microscopy (SEM) measurements exhibited that the functionalization of CNTs with PMDA obviously improved the dispersion of CNTs in the epoxy resin matrix.
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Sun, Xiao Feng, Shi Ning Ma, Jia Wu He, and Nai Shu Zhu. "Study on the Properties of Microwave Curing Epoxy Resin/Nano-Fe Composite Materials." Applied Mechanics and Materials 26-28 (June 2010): 356–59. http://dx.doi.org/10.4028/www.scientific.net/amm.26-28.356.
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Nano-Fe particles were selected as microwave-absorber, and added in the epoxy resin. Epoxy resin/nano-Fe composite materials were cured by microwave irradiation and heating. Vector network analysis, dynamic mechanical analysis(DMA) and scanning electron microscope(SEM) were used to study the curing behaviors of composite materials under the different curing ways. Results show that the dielectric constant(εr) and the dielectric loss factor(tanδ) of the epoxy resin increased obviously when nano-Fe particles were added, and microwave absorption properties of epoxy resin/nano-Fe composite materials improved greatly with increasing contents of nano-Fe particles. DMA results indicate that the storage modulus (E’) and glass transition temperature(Tg) of epoxy resin samples with nano-Fe particles were higher than those without nano-Fe particles. The microstructure and phase composition of the samples were studied by SEM and EDX. Results show that nano-Fe particles were homogeneously dispersed in the epoxy resin matrix under microwave irradiation, which implies improved strength and toughness of epoxy resin/nano-Fe composite materials.