Journal articles: 'Bisphenol-A diglycidyl ether resin'

1

Jordáková, I., J. Dobiáš, M. Voldřich, and J. Postka. "Determination of bisphenol A, bisphenol F, bisphenol A diglycidyl ether and bisphenol F diglycidyl ether migrated from food cans using Gas Chromatography-Mass Spectrometry." Czech Journal of Food Sciences 21, No. 3 (November 18, 2011): 85–90. http://dx.doi.org/10.17221/3481-cjfs.

Full text

Abstract:

Varnishes used for the inner coatings of food cans are mostly based on epoxy resins or vinylic organosols. The epoxy resins are produced from bisphenol A and bisphenol F and they also contain BADGE or BFDGE as stabilising components. A simple method for the quantitative determination of bisphenol A (BPA), bisphenol F (BPF), bisphenol A diglycidyl ether (BADGE), and bisphenol F diglycidyl ether (BFDGE) migrated from food packaging materials was optimised. The can sample was extracted with acetonitrile or with food simulants (distilled water, 3% acetic acid and 10% ethanol) and the extract obtained was analysed by gas chromatography coupled with mass spectrometric detector. The limits of detection and quantification ranged between 0.15–0.86 and 0.51–2.77 µg/dm2, respectively. The migrating levels of bisphenols found in various can samples were for BPA and for BADGE in the range from 0.63 × 10–3 to 0.34 mg/dm2, and from 1.49 × 10–3 to 3.67 mg/dm2, respectively. BPF and BFDGE were practically not detected in the can samples.

APA, Harvard, Vancouver, ISO, and other styles

2

Poustková, I., J. Dobiáš, J. Poustka, and M. Voldřich. "Investigation of bisphenol a diglycidyl ether, bisphenol f diglycidyl ether and their hydroxy and chlorohydroxy derivatives stability in water-based food simulants." Czech Journal of Food Sciences 22, SI - Chem. Reactions in Foods V (January 1, 2004): S272—S275. http://dx.doi.org/10.17221/10679-cjfs.

Full text

Abstract:

Varnishes used as the inner coatings of food cans are often based on epoxy resins or vinylic organosols. The epoxy resins can be produced from bisphenol A (BPA) and bisphenol F (BPF) and they also contain bisphenol A diglycidyl ether (BADGE) of bisphenol F diglycidyl ether (BFDGE) as stabilising components. These compounds may break down during storage and also by influence of food simulants. The stability of BADGE and BFDGE was studied using reverse-phase gradient high performance liquid chromatography (RP-HPLC) with fluorescence detection (FLD). Four experiments were compared: (i) BPA solution at the concentration 3 μg/ml of each food simulant, (ii) BADGE solution at the concentration 3 μg/ml of each food simulant, (iii) BFDGE solution at the concentration 3 μg/ml of each food simulant and (iv) mixture of all bisphenols solution at the concentration 3 μg/ml of each food simulant. Distilled water, 10% ethanol, 95% ethanol and 3% acetic acid were used as food simulants. It was observed that BPA, BADGE and BFDGE were most stabile in 95% ethanol and least stabile in 3% acetic acid. Creation of hydroxy and chlorohydroxy derivatives was in each food simulant different so it cannot be predicted.

APA, Harvard, Vancouver, ISO, and other styles

3

Malburet, Samuel, Chiara Di Mauro, Camilla Noè, Alice Mija, Marco Sangermano, and Alain Graillot. "Sustainable access to fully biobased epoxidized vegetable oil thermoset materials prepared by thermal or UV-cationic processes." RSC Advances 10, no. 68 (2020): 41954–66. http://dx.doi.org/10.1039/d0ra07682a.

Full text

Abstract:

Beyond the need to find a non-toxic alternative to DiGlycidyl Ether of Bisphenol-A (DGEBA), the serious subject of non-epichlorohydrin epoxy resins production remains a crucial challenge that must be solved for the next epoxy resin generations.

APA, Harvard, Vancouver, ISO, and other styles

4

Nikafshar, Saeid, Omid Zabihi, Susan Hamidi, Yousef Moradi, Saeed Barzegar, Mojtaba Ahmadi, and Minoo Naebe. "A renewable bio-based epoxy resin with improved mechanical performance that can compete with DGEBA." RSC Advances 7, no. 14 (2017): 8694–701. http://dx.doi.org/10.1039/c6ra27283e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Rosu, D., F. Mustata, N. Tudorachi, V. E. Musteata, L. Rosu, and C. D. Varganici. "Novel bio-based flexible epoxy resin from diglycidyl ether of bisphenol A cured with castor oil maleate." RSC Advances 5, no. 57 (2015): 45679–87. http://dx.doi.org/10.1039/c5ra05610a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Asano, Toshiyuki, Masahiko Kobayashi, Bunichiro Tomita, and Mikio Kajiyama. "Syntheses and properties of liquefied products of ozone treated wood/epoxy resins having high wood contents." Holzforschung 61, no. 1 (January 1, 2007): 14–18. http://dx.doi.org/10.1515/hf.2007.003.

Full text

Abstract:

Abstract Liquefied products with high wood content were prepared by pretreating wood with ozone before liquefaction. As a result, the ratio of wood to polyhydric alcohol (W/P ratio) used as solvent could be increased to 2:1. Resin blends were prepared by mixing liquefied products with ethylene glycol diglycidyl ether (EGDGE, water-soluble) and diglycidyl ether of bisphenol A (DGEBA, oily consistency). The wood content of the resin blend could be increased to 53%. The resins were cured by citric acid or triethylene tetramine (TETA), and their mechanical properties were evaluated. Dynamic mechanical measurements revealed that the former had higher glass transition temperatures than the latter. It was found that the resin with DGEBA cured by citric acid had almost the same level of tensile strength as commercial plastics.

APA, Harvard, Vancouver, ISO, and other styles

7

Kwon, Woong, Minwoo Han, Jongwon Kim, and Euigyung Jeong. "Comparative Study on Toughening Effect of PTS and PTK in Various Epoxy Resins." Polymers 13, no. 4 (February 9, 2021): 518. http://dx.doi.org/10.3390/polym13040518.

Full text

Abstract:

This study investigated the toughening effect of in situ polytriazoleketone (PTK) and polytriazolesulfone (PTS) toughening agent when applied to various epoxy resins, such as diglycidyl ether of bisphenol A (DGEBA), diglycidyl ether of bisphenol F (DGEBF), and triglycidyl p-aminophenol (TGAP) with 3,3′-diaminodiphenylsulfone as a curing agent. The fracture toughness, tensile properties, and thermal properties of the prepared epoxy samples were evaluated and compared. When PTK was mixed with DGEBF, the fracture toughness was improved by 27% with 8.6% increased tensile strength compared to the untoughened DGEBF. When PTS was mixed with TGAP, the fracture toughness was improved by 51% without decreasing tensile properties compared to the untoughened TGAP. However, when PTK or PTS was mixed with other epoxy resins, the fracture toughness decreased or improved with decreasing tensile properties. This is attributed to the poor miscibility between the solid-state monomer of PTK (4,4′-bis(propynyloxy)benzophenone (PBP)) or PTS (4,4′-sulfonylbis(propynyloxy)benzene (SPB)) and the epoxy resin, resulting in the polymerization of low molecular weight PTK or PTS in epoxy resin. Therefore, the toughening effect of PTK or PTS can be maximized by the appropriate selection of epoxy resin based on the miscibility between PBP or SPB and the resin.

APA, Harvard, Vancouver, ISO, and other styles

8

Chandran, Sarath, F. Antolasic, K. J. Eichhorn, Robert A. Shanks, and S. Thomas. "Stereochemistry and miscibility of epoxy resin–poly(trimethylene terephthalate) blends." RSC Adv. 4, no. 48 (2014): 25420–29. http://dx.doi.org/10.1039/c4ra01429d.

Full text

Abstract:

Stereochemistry is proposed to contribute to the miscibility of poly(trimethylene terephthalate) (PTT) and bisphenol-A diglycidyl ether (BADGE), since molecular conformation is one of the determinants of the close packing ability and hence the interactions of such a system.

APA, Harvard, Vancouver, ISO, and other styles

9

Janerva, Lasse, Ritta Jolanki, Liisa Halmepuro, Heskinen, and Tuula Estlander. "Immediate and delayed allergy to diglycidyl ether bisphenol A epoxy resin." Contact Dermatitis 23, no. 4 (October 1990): 252. http://dx.doi.org/10.1111/j.1600-0536.1990.tb05048.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Kanerva, L., M. Pelttari, R. Jolanki, K. Alanko, T. Estlander, and R. Suhonen. "Occupational contact urticaria from diglycidyl ether of bisphenol A epoxy resin." Allergy 57, no. 12 (December 2002): 1205–7. http://dx.doi.org/10.1034/j.1398-9995.2002.13118.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Tian, Qiao, Yan Chao Yuan, Min Zhi Rong, and Ming Qiu Zhang. "Synthesis and Characterization of a Novel Epoxy with Improved Processability." Advanced Materials Research 47-50 (June 2008): 290–93. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.290.

Full text

Abstract:

For purposes of developing a novel epoxy with low viscosity and high activity, N,N-diglycidyl-furfurlamine (DGFA) was successfully synthesized through a two-step reaction between 2-furfurylamine and epichlorohydrin involving ring-opening and ring-closure mechanisms. The product structure was verified by FTIR, 1H-NMR, 13C-NMR and elemental analysis, respectively. Its viscosity was found to be 0.02 Pa·s at 25oC. To understand its curing behavior, exothermic habit of the model mixture of DGFA and the curing agent methylhexahydrophthalic anhydride (MHHPA) at stoichiometric ratio of epoxy ring/anhydride of 1:0.8 was inspected with DSC. By changing the heating rates from 2.5 to 15oC/min, activation energy for consolidation of the resin was estimated to be 46.2 kJ/mol, which is much lower than the value involved in curing of diglycidyl ether of bisphenol A catalyzed by anhydride. Besides, thermal decomposition performance of cured version of the newly synthesized epoxy was also examined. The predominant pyrolysis took place at around 330-390oC as a result of chain scission of epoxy. The cured resin possesses comparable mechanical properties as conventional diglycidyl ether of bisphenol A. Its flexural strength and modulus are 111MPa and 3.6GPa, respectively. Evidently, the resultant epoxy is provided with balanced properties for practical applications.

APA, Harvard, Vancouver, ISO, and other styles

12

Liu, Yu Yan, Song Quan Wu, Li Li, Yu Ting Liu, and Guo Hua Shan. "Chemical Recycling of Epoxide-Anhydride Hardened Networks Using Near-Critical Water." Advanced Materials Research 658 (January 2013): 153–57. http://dx.doi.org/10.4028/www.scientific.net/amr.658.153.

Full text

Abstract:

The degradation behaviour of an anhydride-cured bisphenol A diglycidyl ether (DGEBA) epoxy resin in near-critical water was studied in this paper. The experiments were performed in a stainless steel reactor (100ml) without stirring. Epoxy resin could be decomposed successfully at 270°C for 30 min. The degradation rate of epoxy resin increased with an increase in reaction temperature and reaction pressure. The degradation reaction products were characterized by gas chromatography-mass spectrometry (GC-MS). The degradation reaction was associated with the scission of ester and ether bonds which further destabilizes the epoxy network.

APA, Harvard, Vancouver, ISO, and other styles

13

Xi, Zheng, Jin Dian Ding, Wen Jun Gan, and Zhao Zhang. "Curing Behavior of Epoxy Resin Mixed with Epoxypropoxypropyl Terminated Polydimethylsiloxane." Advanced Materials Research 677 (March 2013): 197–200. http://dx.doi.org/10.4028/www.scientific.net/amr.677.197.

Full text

Abstract:

Diglycidyl ether of bisphenol A (DGEBA) and epoxypropoxypropyl terminated polydimethylsiloxane (ETDMS) were mixed in different proportion. The morphology of ETDMS modified epoxy systems was observed by scanning electronic microscope (SEM). Curing kinetics was also studied by differential scanning calorimetry (DSC). It was suggested that the formation of the microstructures followed reaction-induced microphase separation mechanism.

APA, Harvard, Vancouver, ISO, and other styles

14

Ekincioglu, Ozgur, M. Hulusi Ozkul, Yoshihiko Ohama, Silvia Patachia, and Georgeta Moise. "Effect of Epoxy Resin Addition on the Moisture Sensitivity of Macro Defect Free Polymer-Cement Composites." Key Engineering Materials 466 (January 2011): 65–72. http://dx.doi.org/10.4028/www.scientific.net/kem.466.65.

Full text

Abstract:

Macro-defect-free (MDF) cements are cement-polymer composites and were developed by Birchall et al. three decades ago. The composites are produced by mixing small amounts of polymer and water with cement. However, they have a different production method than that of cement pastes, which was inspired by rubber production. Mixtures of cement, polymer and water are processed by using a two-roll mill. The composites are known with their high flexural strengths. Unfortunately, there are not any known commercial products using MDF cements because of their poor durability under moisture. In this study, MDF cements were prepared by using poly(vinyl alcohol--vinyl acetate) PVA, calcium aluminate cements and two different types of epoxy resins. Epoxy resins were a diglycidyl ether of bisphenol A and a mixture of a diglycidyl ethers of bisphenol A and F. Durability performance was compared with respect to biaxial flexural strengths, contact angle and atomic force microscopy (AFM) for the specimens stored in water.

APA, Harvard, Vancouver, ISO, and other styles

15

Chike, K. E., M. L. Myrick, R. E. Lyon, and S. M. Angel. "Raman and Near-Infrared Studies of an Epoxy Resin." Applied Spectroscopy 47, no. 10 (October 1993): 1631–35. http://dx.doi.org/10.1366/0003702934334714.

Full text

Abstract:

A quantitative comparison of Raman and Fourier transform near-infrared (FT-NIR) spectroscopic techniques for the analysis of epoxy curing is performed. It is shown that the Raman technique yields a linear calibration curve much like FT-NIR. Band assignments in the Raman spectrum of diglycidyl ether of bisphenol-A (DGEBA) were performed by studying Raman spectra of smaller model compounds.

APA, Harvard, Vancouver, ISO, and other styles

16

Yang, Li, Miao Yin, Xiu Yun Li, and Han Bing Ma. "Thermal and Dielectric Properties of Inorganic-Organic Nanocomposites Involving Epoxy Resin and Polyhedral Oligomeric Silsesquioxanes." Advanced Materials Research 476-478 (February 2012): 665–69. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.665.

Full text

Abstract:

In this paper, a type of nanoporous polyhedral oligomeric silisesquioxanes (POSS) containing eight functional groups have been synthesized and mixed with diglycidyl ether of bisphenol A (DGEBA) to form epoxy resin networks with nanostructures. The cured octa(aminophenyl) silsesquioxane (1c-POSS) and DGEBA system inherently possesses higher thermal stability and higher char yield than the control epoxy resins. Furthermore, the dielectric constant of the 1c-POSS/DGEBA material (4.36) is substantially lower than that of the neat epoxy resins (4.64) as a consequence the presence of nanoporous POSS cubes in the epoxy matrix.

APA, Harvard, Vancouver, ISO, and other styles

17

Wang, Tao, Jun Wang, and Bin Zhang. "Toughening of Epoxy Resin Modified with In Situ Polymerized Acrylate Copolymer." Advanced Materials Research 910 (March 2014): 70–73. http://dx.doi.org/10.4028/www.scientific.net/amr.910.70.

Full text

Abstract:

P(BA-St), a good modifier for epoxy resin, was prepared by BA and St in situ polymerization. The modified resin system was based on diglycidyl ether of bisphenol and methyl tetrahydrophthalic anhydride, tris (dimethylaminomethyl) phenol. The influence of the copolymer on mechanical properties and thermal performance of the systems was studied. When 15 wt% of the BA/St with a weight ratio composition of 7.5/7.5 was added to epoxy, high performance modified epoxy resin was obtained.

APA, Harvard, Vancouver, ISO, and other styles

18

Zhu, Jing, Yong Wu, Lei Zhao, Hong Liang Wei, Hui Juan Chu, and Juan He. "Study of Thermal Properties of Curing of DGEBA Epoxy Resin with Hexakis-(4-Aminophenoxy)-Cyclotriphosphazene." Advanced Materials Research 284-286 (July 2011): 365–68. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.365.

Full text

Abstract:

Hexakis-(4-aminophenoxy)-cyclotriphosphazene (PN-NH2) was synthesized through nucleophilic substitution of the chloride atoms of hexachlorocyclotriphosphazene (HCCP) and reduction of the nitro group, and its chemical structure was characterized. As a curing agents for commercial epoxy resin Diglycidyl ether of bisphenol-A (DGEBA) PN-NH2 was compared with conventional curing agents 4,4-diaminodiphenylsulfone(DDS) and 4,4-diaminodiphenylmethane (DDM). The thermal properties and thermal degradation behaviors of these thermosetted resins were investigated by using thermogravimetric analysis (TGA). TGA studies demonstrated that the thermal properties of the PN-NH2-containing cured epoxy resin were higher than those of others. The phosphorus-nitrogen containing curing agent can result in a great improvement of the flame retardance for their thermosetted epoxy resins.

APA, Harvard, Vancouver, ISO, and other styles

19

Patel, Kanuprasad, Dhirubhai Desai, and Santosh Bhuva. "Development and Characterization of Novel Interpenetrating Network (IPN) Foams from Epoxy Ester and Aliphatic Epoxy Resin." E-Journal of Chemistry 6, no. 2 (2009): 341–47. http://dx.doi.org/10.1155/2009/481912.

Full text

Abstract:

Diglycidyl ether of bisphenol-A (DGEBA) was reacted with acrylate monomer at variable molar ratios. The reaction between glycerine and epichlorohydrine form glycidyl ether of polyol aliphatic epoxy resin. The resultant resins were characterized duly. Both the resins were mixed at different ratios with constant high shear stirring. The obtained mixture and suitable additives were heated at 150oC for one and half hour. The so called Interpenetrating Network (IPN) transformed into foams. The performance of foams was evaluated by testing for compression in both parallel and perpendicular to rise direction. The tests were carried out at room temperature and at the elevated temperature. The compression properties showed a decreasing trend for increasing amounts of glycerine resin. The density and thermal properties of epoxy foams were also evaluated. The relation between the composition, density and properties of the foam was analyzed.

APA, Harvard, Vancouver, ISO, and other styles

20

Patel, Hasmukh S., and Kumar K. Panchal. "Interacting Blends of Novel Unsaturated Polyester Amide Resin with Styrene." E-Journal of Chemistry 1, no. 1 (2004): 32–37. http://dx.doi.org/10.1155/2004/521631.

Full text

Abstract:

Novel unsaturated poly (ester-amide) resins (UPEAs) were prepared by the reaction between an epoxy resin, namely diglycidyl ether of bisphenol–A (DGEBA) and unsaturated aliphatic bisamic acids using a base catalyst. These UPEAs were then blended with a vinyl monomer namely, Styrene (STY.) to produce a homogeneous resin syrup. The curing of these UPEAs-STY. resin blends was carried out by using benzoyl peroxide (BPO) as a catalyst and was monitored by using a differential scanning calorimeter (DSC). The glass fibre reinforced composites (i.e. laminates) of these UPEA-STY. resin blends were fabricated using the DSC data. The chemical, mechanical and electrical properties of the glass fibre composites have also been evaluated. The unreinforced cured samples of the UPEA-STY. resin blends were also analyzed by thermogravimetry (TGA).

APA, Harvard, Vancouver, ISO, and other styles

21

Patel, H. S., K. K. Panchal, S. R. Patel, and S. N. Desai. "Interacting Blends of Novel Unsaturated Polyester Amide Resin with Vinyl Acetate." E-Journal of Chemistry 1, no. 5 (2004): 237–42. http://dx.doi.org/10.1155/2004/924136.

Full text

Abstract:

Novel unsaturated poly (ester- amide) resins (UPEAs) were prepared by the reaction between an epoxy resin, namely diglycidyl ether of bisphenol–A (DGEBA) and unsaturated aliphatic bisamic acids using a base catalyst. These UPEAs were then blended with a vinyl monomer namely, Vinyl acetate (VA) to produce a homogeneous resin syrup. The curing of these UPEAs-VA resin blends was carried out by using benzoyl peroxide (BPO) as an initiator for the radical polymerization and was monitored by using a differential scanning calorimeter (DSC). The glass fibre reinforced composites (i.e. laminates) of these UPEA-VA resin blends were fabricated using the DSC data. The chemical, mechanical and electrical properties of the glass fibre composites have also been evaluated. The unreinforced cured samples of the UPEA-VA resin blends were also analyzed by thermogravimetry (TGA).

APA, Harvard, Vancouver, ISO, and other styles

22

Pachha, R. R., J. R. Thakkar, and R. D. Patel. "Studies of vinyl ester resins and their urethanized derivatives." High Performance Polymers 5, no. 3 (June 1993): 207–12. http://dx.doi.org/10.1088/0954-0083/5/3/004.

Full text

Abstract:

The epoxy resins diglycidyl ether of bisphenol A and triglycidyl p-amino phenol were reacted with acrylic acid to afford the corresponding acrylated resins. These vinyl ester resins were then reacted with toluene di-isocyanate to procure their urethanized derivatives. All these resins were characterized by their viscosity, number average molecular weight and infrared spectrophotometry. Curingconditions for these resins were established by differential scanning calorimetry. The results indicated that the curing reaction follows first-order kinetics, with activation energy in the range 53-84 kJ mol-. Styrene monomer was observed to lower the curing temperature of all resin systems when incorporated prior to curing.

APA, Harvard, Vancouver, ISO, and other styles

23

Acocella, M. R., C. Esposito Corcione, A. Giuri, M. Maggio, A. Maffezzoli, and G. Guerra. "Graphene oxide as a catalyst for ring opening reactions in amine crosslinking of epoxy resins." RSC Advances 6, no. 28 (2016): 23858–65. http://dx.doi.org/10.1039/c6ra00485g.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Pham, H. L., B. T. Do, T. S. Pham, and D. G. Le. "Toughening of Bisphenol-A Diglycidyl Ether-based Epoxy by Modification with Hydroxyl-terminated Liquid Natural Rubber." ASEAN Journal on Science and Technology for Development 30, no. 1&2 (December 18, 2017): 22–28. http://dx.doi.org/10.29037/ajstd.346.

Full text

Abstract:

Hydroxyl-terminated liquid natural rubbers (HTNRs), prepared by the Photo-Fenton reaction, were used to modify bisphenol-A diglycidyl ether-based epoxy (DGEBA). A chemical link between HTNRs and the epoxy resin was promoted employing toluene diisocyanate. The reactions between elastomers and epoxy resin were followed by FTIR. The mechanical properties of the composites were evaluated and the microstructure was investigated using scanning electronic microscopy. The results showed that the impact resistance of HTNR-modified DGEBA was superior to that of the pure epoxy resin. For the composites with HTNR, the impact resistance increased with elastomer concentration up to 2.5 parts per hundred parts of resin. Higher concentration of HTNR resulted in larger particles which gave lower impact values.

APA, Harvard, Vancouver, ISO, and other styles

25

Francis, Bejoy, Sabu Thomas, R. Sadhana, Nicole Thuaud, R. Ramaswamy, Seno Jose, and V. Lakshmana Rao. "Diglycidyl ether of bisphenol-A epoxy resin modified using poly(ether ether ketone) with pendenttert-butyl groups." Journal of Polymer Science Part B: Polymer Physics 45, no. 17 (2007): 2481–96. http://dx.doi.org/10.1002/polb.21238.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Kireev, Bilichenko, Borisov, Mu, Kuznetsov, Eroshenko, Filatov, and Sirotin. "Synthesis of Bisphenol A Based Phosphazene-Containing Epoxy Resin with Reduced Viscosity." Polymers 11, no. 12 (November 20, 2019): 1914. http://dx.doi.org/10.3390/polym11121914.

Full text

Abstract:

Phosphazene-containing epoxy oligomers (PEO) were synthesized by the interaction of hexachlorocyclotriphosphazene (HCP), phenol, and bisphenol A in a medium of excess of epichlorohydrin using potassium carbonate and hydroxide as HCl acceptors with the aim of obtaining a product with lower viscosity and higher phosphazene content. PEOs are mixtures of epoxycyclophosphazene (ECP) and a conventional organic epoxy resin based on bisphenol A in an amount controlled by the ratio of the initial mono- and diphenol. According to 31P NMR spectroscopy, pentasubstituted aryloxycyclotrophosphazene compounds predominate in the ECP composition. The relative content in the ECP radicals of mono- and diphenol was determined by the MALDI-TOF mass spectrometry method. The organic epoxy fraction, according to gas chromatograpy-mass spectrometry (GC-MS), contains 50–70 wt % diglycidyl ether of bisphenol A. PEO resins obtained in the present work have reduced viscosity when compared to other known phosphazene-containging epoxy resins while phosphazene content is still about 50 wt %. Resins with an epoxy number within 12–17 wt %, are cured by conventional curing agents to form compositions with flame-retardant properties, while other characteristics of these compositions are at the level of conventional epoxy materials.

APA, Harvard, Vancouver, ISO, and other styles

27

Park, Soo Jin, K. Li, and S. K. Hong. "Thermal Stabilities and Mechanical Interfacial Properties of Polyethresulfone-Modified Epoxy Resin." Solid State Phenomena 111 (April 2006): 159–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.111.159.

Full text

Abstract:

The thermal stabilities and mechanical interfacial properties of a diglycidyl ether of bisphenol-A (DGEBA) epoxy resin modified with different contents of polyethersulfone (PES) have been investigated. As a result, the curing reaction rate of DGEBA/PES blends was decreased with increasing the PES content. The blends exhibited slight decrease of thermal stabilities compared to the neat DGEBA. The mechanical interfacial properties, characterized by KIC, were significantly increased as the PES content increased.

APA, Harvard, Vancouver, ISO, and other styles

28

Awad, Sameer A., Christopher M. Fellows, and Seyed S. Mahini. "Evaluation of bisphenol A-based epoxy resin containing multiwalled carbon nanotubes to improve resistance to degradation." Journal of Composite Materials 53, no. 21 (December 3, 2018): 2981–91. http://dx.doi.org/10.1177/0021998318816784.

Full text

Abstract:

The influence of exposure to UV light and moisture on the durability of a multiwalled carbon nanotube(MWCNT)/epoxy nanocomposite was investigated. Samples of epoxy resin based on diglycidyl ether of bisphenol A (DGEBA) cured with 2,2,4-trimethylene-1,6-hexadiamine (TMDA), and epoxy nanocomposite containing 0.5% MWCNT were exposed to different accelerated weathering times between one and six months. Changes in surface chemistry, mechanical properties (tensile tests), thermal properties (thermogravimetric analysis and differential scanning calorimetry), and morphology were evaluated before and after exposure to accelerated weathering for a period of up to six months. Epoxy nanocomposite (DGEBA–TMDA/0.5%MWCNT) samples had improved thermal stability and resistance to degradation, compared to epoxy resin (DGEBA–TMDA). The effect of MWCNT at reducing degradation was more pronounced than previously found for resins prepared with hydrogenated DGEBA.

APA, Harvard, Vancouver, ISO, and other styles

29

Xu, Peijun, Peiliang Cong, Zhao Gao, Ming Du, Zhipeng Wang, and Shuanfa Chen. "High performance modification of hyperbranched polyborate on diglycidyl ether of bisphenol-a resin." Polymer Composites 36, no. 3 (March 4, 2014): 424–32. http://dx.doi.org/10.1002/pc.22956.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Arcos Casarrubias, JA, A. Reyes-Mayer, R. Guardian-Tapia, P. Castillo-Ocampo, and A. Romo-Uribe. "Rubber Nanodomains Reinforced Epoxy Resin." MRS Advances 1, no. 21 (2016): 1571–76. http://dx.doi.org/10.1557/adv.2016.297.

Full text

Abstract:

ABSTRACTIt has been reported that the addition of liquid rubbers, like poly(dimethylsiloxane) (PDMS), to epoxy resins alter the final morphology, increase the toughness and influence the curing kinetics. Due to immiscibility, there is phase separation of the elastomeric phase during curing giving rise to microdomains embedded in the epoxic matrix. The resultant heterogeneous morphology obtained after the reaction controls to an important extent the properties of the epoxy composite. Here we report a method to obtain well-dispersed rubber nanodomains of silyl-diglycidyl ether terminated polydimethyl siloxane (PDMS-DGE) in diglycidyl ether of bisphenol-A (DGEBA) epoxy by using a prepolymerization step. Light scattering and optical microscopy showed that initial mixing of pre-polymerized rubber produced phase separation with micron-scale droplet formation. However, as the curing reaction proceeded, the rubber domains decreased below optical resolution, light scattering intensity reached a maximum and then decreased. Finally, rubber nanodomains of about 100 nm size were formed at the end of curing reaction, as revealed by transmission electron microscopy (TEM). The pre-polymerization step induced a two-fold increase in gel time, tgel, due to lesser active groups available for reaction. Strikingly, tensile modulus and toughness increased, suggesting rubber-epoxy interaction. The final nanocomposite also exhibited higher thermal stability and char formation.

APA, Harvard, Vancouver, ISO, and other styles

31

Amaral, Camila Rodrigues, Ruben Jesus Sanchez Rodriguez, Magno Luiz Tavares Bessa, Verônica Scarpini Cândido, and Sergio Neves Monteiro. "Mechanichal Properties of DGEBA/TEPA Modified Epoxy Resin." Materials Science Forum 775-776 (January 2014): 588–92. http://dx.doi.org/10.4028/www.scientific.net/msf.775-776.588.

Full text

Abstract:

The correlation between the structural network of a diglycidyl ether of the bisphenol-A (DGEBA) epoxy resin, modified by two distinct aliphatic amines (tetraethylenepentamine TEPA and jeffamine D230), and its mechanical properties, was investigated as possible matrix for abrasive composites applications. Both flexural tests, to determine the yield stress and the elastic modulus, as well as impact tests to determine the notch toughness, were performed. The DGEBA/D230 presented the highest stiffness and toughness but lowest yield stress. This epoxy network also displayed a greater plastic deformation during fracture.

APA, Harvard, Vancouver, ISO, and other styles

32

Lv, Yong, Zhu Long, Shi Yong Luo, and Lei Dai. "Kinetics of the Curing Reaction of a Diglycidyl Ether of Bisphenol with a Methanol Etherified Amino Resin." Advanced Materials Research 380 (November 2011): 60–63. http://dx.doi.org/10.4028/www.scientific.net/amr.380.60.

Full text

Abstract:

Subscript text Subscript textEpoxy resins have been widely used for inner coating in food can and other chemical products storage containers. Differential scanning calorimetry (DSC) was used at different heating rates to study the cure kinetics of the diglycidyl ether of bisphenol A (DGEBA) with a methanol etherified amino resin (MEAR). The apparent activation energy derived from Kissinger and Ozawa methods is 35.67KJ/mol and 40.27kJ/mol, respectively. The reaction order evaluated by Crane equation is 0. 95 and the frequency factor is 1.12×104s-1. Reaction mechanism was monitored by FTIR spectra of the reaction mixtures before and after curing. The curing reaction below 200°C is between alkoxylmethyl (>NCH2OCH3) and epoxide group, not between alkoxylmethyl and hydroxyls.

APA, Harvard, Vancouver, ISO, and other styles

33

Kinaci, Emre, Erde Can, John Scala, and Giuseppe Palmese. "Influence of Epoxidized Cardanol Functionality and Reactivity on Network Formation and Properties." Polymers 12, no. 9 (August 29, 2020): 1956. http://dx.doi.org/10.3390/polym12091956.

Full text

Abstract:

Cardanol is a renewable resource based on cashew nut shell liquid (CNSL), which consists of a phenol ring with a C15 long aliphatic side chain in the meta position with varying degrees of unsaturation. Cardanol glycidyl ether was chemically modified to form side-chain epoxidized cardanol glycidyl ether (SCECGE) with an average epoxy functionality of 2.45 per molecule and was cured with petroleum-based epoxy hardeners, 4-4′-methylenebis(cyclohexanamine) and diethylenetriamine, and a cardanol-based amine hardener. For comparison, cardanol-based diphenol diepoxy resin, NC514 (Cardolite), and a petroleum-based epoxy resin, diglycidyl ether of bisphenol-A (DGEBA) were also evaluated. Chemical and thermomechanical analyses showed that for SCECGE resins, incomplete cure of the secondary epoxides led to reduced cross-link density, reduced thermal stability, and reduced elongation at break when compared with difunctional resins containing only primary epoxides. However, because of functionality greater than two, amine-cured SCECGE produced a Tg very similar to that of NC514 and thus could be useful in formulating epoxy with renewable cardanol content.

APA, Harvard, Vancouver, ISO, and other styles

34

Leal, Artur Soares Cavalcanti, Carlos Jose de Araújo, Antônio Gilson de Barbosa Lima, and Suédina Maria Lima Silva. "Thermomechanical Behavior of High Performance Epoxy/Organoclay Nanocomposites." Advances in Materials Science and Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/102695.

Full text

Abstract:

Nanocomposites of epoxy resin containing bentonite clay were fabricated to evaluate the thermomechanical behavior during heating. The epoxy resin system studied was prepared using bifunctional diglycidyl ether of bisphenol A (DGEBA), crosslinking agent diaminodiphenylsulfone (DDS), and diethylenetriamine (DETA). The purified bentonite organoclay (APOC) was used in all experiments. The formation of nanocomposite was confirmed by X-ray diffraction analysis. Specimens of the fabricated nanocomposites were characterized by dynamic mechanical analysis (DMA). According to the DMA results a significant increase in glass transition temperature and storage modulus was evidenced when 1 phr of clay is added to epoxy resin.

APA, Harvard, Vancouver, ISO, and other styles

35

Wang, Xi. "Dynamic Mechanical Properties of Epoxy Resin with Multifunctional Polyamine Curing Agent." Applied Mechanics and Materials 744-746 (March 2015): 1374–77. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1374.

Full text

Abstract:

A nonlinear multifunctional polyamine N,N,N’,N’-tetra (3-aminopropyl)-1,6-diamino-hexane (TADH), was prepared and employed as a novel hardener for diglycidyl ether of bisphenol A (DGEBA). Nonisothermal reactions of DGEBA/TADH were systematically investigated with differential scanning calorimetry (DSC). In addition, analysis of thermal stability of the cured DGEBA/TADH with thermogravimetric analysis (TGA) revealed that it possessed quite good thermal stability and increased residual char content at 600◦C in nitrogen. Furthermore, dynamic mechanical analysis (DMA) of the DGEBA/TADH network showed its relaxations were characterized by localized motions of hydroxyl ether segments and cooperative motions of whole network chains (glass relaxation) at different temperature regions.

APA, Harvard, Vancouver, ISO, and other styles

36

Ponten, Ann, and Magnus Bruze. "Contact allergy to epoxy resin based on diglycidyl ether of bisphenol F." Contact Dermatitis 44, no. 2 (February 2001): 111–12. http://dx.doi.org/10.1034/j.1600-0536.2001.440209-2.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Pontén, Ann, and Magnus Bruze. "Contact allergy to epoxy resin based on diglycidyl ether of bisphenol F." Contact Dermatitis 44, no. 2 (February 2001): 98–100. http://dx.doi.org/10.1034/j.1600-0536.2001.4402092.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Kudłak, Błażej, Natalia Jatkowska, Paweł Kubica, Galina Yotova, and Stefan Tsakovski. "Influence of Storage Time and Temperature on the Toxicity, Endocrine Potential, and Migration of Epoxy Resin Precursors in Extracts of Food Packaging Materials." Molecules 24, no. 23 (December 2, 2019): 4396. http://dx.doi.org/10.3390/molecules24234396.

Full text

Abstract:

The aim of the present study was to establish a standard methodology for the extraction of epoxy resin precursors from several types of food packages (cans, multi-layered composite material, and cups) with selected simulation media (distilled water, 5% ethanol, 3% dimethyl sulfoxide, 5% acetic acid, artificial saliva) at different extraction times and temperatures (factors). Biological analyses were conducted to determine the acute toxicity levels of the extracts (with Vibrio fischeri bacteria) and their endocrine potential (with Saccharomyces cerevisiae yeasts). In parallel, liquid chromatography-tandem mass spectrometry was performed to determine levels of bisphenol A diglycidyl ether (BADGE), bisphenol F diglycidyl ether (mixture of isomers, BFDGE), ring novolac glycidyl ether (3-ring NOGE), and their derivatives. The variation induced by the different experimental factors was statistically evaluated with analysis of variance simultaneous component analysis (ASCA). Our findings demonstrate the value of using a holistic approach to best partition the effects contributing to the end points of these assessments, and offer further guidance for adopting such a methodology, thus being a broadly useful reference for understanding the phenomena related to the impacts of food packaging materials on quality for long- and short-term storage, while offering a general method for analysis.

APA, Harvard, Vancouver, ISO, and other styles

39

Kim, Jung Gon, Kyoung Hoon Shin, Ho Seok Ryu, and Jae Wook Lee. "Monitoring the Change of Viscosity during Cure Reaction of Epoxy Resins with Resin Position Sensor." Journal of Reinforced Plastics and Composites 21, no. 2 (January 2002): 139–52. http://dx.doi.org/10.1177/0731684402021002353.

Full text

Abstract:

It was required that the fundamental understanding of the resin’s rheological properties, such as viscosity, gel point and degree of cure are known during the processing of epoxy resin. In order to monitor these properties in-situ, a sensor system that can measure the viscosity changes during cure is needed. The resin position sensor (RPS) based on DC conductometry has been able to measure the ionic contents and electrical conductivity of most organic resins. Complex viscosity and electrical resistance were measured simultaneously during the cure of diglycidyl ether of bisphenol-A (DGEBA) epoxy resin with polyamide by mounting the RPS on the upper plate of rotational rheometer. To correlate the viscosity with the resistance, the rheological model for the viscosity changes and the electrical model for the resistance changes were used. From the results, the interrelationship of viscosity and resistance of epoxy resin could be confirmed.

APA, Harvard, Vancouver, ISO, and other styles

40

Patel, Hasmukh S., and Sanket N. Shah. "Novel Bismaleimide–Epoxy Resin System: II." High Performance Polymers 8, no. 2 (June 1996): 233–42. http://dx.doi.org/10.1088/0954-0083/8/2/005.

Full text

Abstract:

Novel diamines, namely N, N′-bis[1-(2-methyl-4-aminophenyl)ethanonyl]-1,4- benzenediamine (BMAED 1) and N, N′-bis[1-(4-methyl-3-animophenyl)ethanonyl]-1,4-benzenediamine (BMAED 2), have been prepared and reacted with various bismaleimides (BM) at a BM:diamine ratio of 1:2. The resulting oligoimides have been characterized by elemental analysis, IR spectral studies and the number average molecular weight ( Mn) estimated by non-aqueous conductometric titration and thermogravimetry. Some of the oligomides have been modified by addition (i.e. curing reaction) of epoxy resin, namely the diglycidyl ether of bisphenol-A, and studied by differential scanning calorimetry (DSC). The glass- and carbon-reinforced composites have also been prepared and characterized by their mechanical properties.

APA, Harvard, Vancouver, ISO, and other styles

41

Choi, Ho Kyoung, Jae Hyun Choi, Hyeoung Seok Lee, and Jae Sik Na. "Liquid Crystalline Epoxy Resin Cured with Azomethine Hardening Compounds." Applied Mechanics and Materials 749 (April 2015): 22–24. http://dx.doi.org/10.4028/www.scientific.net/amm.749.22.

Full text

Abstract:

Bisphenol of 4,4’-dihydroxy-N-benzylidene-4-aminophenol containing azomethine group was synthesized via condensation of an aromatic amine namely 4-aminophenol with p-hydroxybenz aldehyde. It’s epoxy derivate and epicholorohydrin produced the new liquid crystalline diglycidyl ether of 4,4’-dihydroxy-N-benzylidene-4-aminophenol. A new type of liquid crystalline epoxy and azoemthine hardening agent are characterized at 300°C for 10 min, using c11z as a catalyst. The chemical structures were confirmed by FT-IR,1H-NMR. The curing reaction with 4,4’-dihydroxy-N-benzylidene-4-aminophenol were carried out in the ratio of glycidyl ether of 4,4’-dihydroxy-N-benzy lidene-4-aminophenol/azomethine hardening 1:0.8. The degree of crystallinity studied by X-ray diffractometer, differential scanning calorimetry (DSC) and polarized optical microscope (POM).

APA, Harvard, Vancouver, ISO, and other styles

42

Beszterda, Monika, Małgorzata Kasperkowiak, Magdalena Frańska, Sandra Jęziołowska, and Rafał Frański. "Ethoxylated Butoxyethanol-BADGE Adducts—New Potential Migrants from Epoxy Resin Can Coating Material." Materials 14, no. 13 (July 1, 2021): 3682. http://dx.doi.org/10.3390/ma14133682.

Full text

Abstract:

The acetonitrile extracts of can-coating materials have been analyzed by using high-pressure liquid chromatography/electrospray ionization-mass spectrometry (HPLC/ESI-MS). On the basis of detected ions [M + H]+, [M + NH4]+, [M + Na]+ and product ions, the ethoxylated butoxyethanol-bisphenol A diglycidyl ether adducts were identified in two of the analyzed extracts. Although the oxyethylene unit-containing compounds are widely used for the production of different kinds of materials, the ethoxylated species have not been earlier detected in epoxy resin can-coatings.

APA, Harvard, Vancouver, ISO, and other styles

43

Fang, Wang, Xiao Jun, Wang Jing-wen, and Li Shu-qin. "Study on curing kinetics of a diglycidyl ether of bisphenol A epoxy resin/microencapsulated curing agent system." High Performance Polymers 24, no. 8 (September 18, 2012): 730–37. http://dx.doi.org/10.1177/0954008312451475.

Full text

Abstract:

A modified imidazole curing agent, EMI-g-BGE, was encapsulated for one-package of diglycidyl ether of bisphenol A (DGEBA) epoxy resin system. Polyetherimide (PEI) was used as the wall material, and the emulsion solvent evaporation method was used to form the microcapsules. The morphology and particle size distribution of microcapsules were evaluated by scanning electron microscopy (SEM), mastersizer analyzer. Microcapsules exhibited spherical shapes and the mean particle size was about 745 nm. The curing kinetic of DGEBA/microcapsules curing agent was studied by nonisothermal differential scanning calorimetry (DSC) technique at different heating rates. Dynamic DSC scans indicated the microcapsule was an effective curing agent of epoxy resin. The apparent activation energy Ea was 88.03 kJ/mol calculated through Kissinger method, more than DGEBA/EMI-g-BGE system. This microcapsule of EMI-g-BGE exhibited a long shelf life, and the curing did not occur in this epoxy-microcapsule resin system for more than 3months at room temperature. The kinetic parameters were determined by Málek method and a two-parameter ( m, n) autocatalytic model (Šesták–Berggren equation) was found to be the most adequate selected kinetic model, which showed the encapsulation of the curing agent EMI-g-BGE did not change the cure reaction mechanism of the epoxy resin system. From the experimental data, the nonisothermal DSC curves show the results being in accordant with those theoretically calculated.

APA, Harvard, Vancouver, ISO, and other styles

44

Francis, Bejoy, R. Ramaswamy, V. Lakshmana Rao, and Sabu Thomas. "Toughening of Diglycidyl Ether of Bisphenol-A Epoxy Resin Using Poly (Ether Ether Ketone) with Pendent Ditert-Butyl Groups." International Journal of Polymeric Materials 55, no. 9 (September 2006): 681–702. http://dx.doi.org/10.1080/00914030500323326.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Song, Lingxia, Yeyun Meng, Peng Lv, Weiqu Liu, and Hao Pang. "Preparation of a Dmap-Catalysis Lignin Epoxide and the Study of Its High Mechanical-Strength Epoxy Resins with High-Biomass Content." Polymers 13, no. 5 (February 28, 2021): 750. http://dx.doi.org/10.3390/polym13050750.

Full text

Abstract:

The depletion of limited petroleum resources used for the fabrication of epoxy resins calls for the development of biomass-based epoxides as promising alternatives to petroleum-derived epoxides. However, it is challenging to obtain an epoxy resin with both high lignin content and excellent mechanical performance. Herein, a 4-dimethylaminopyridine (DMAP)-lignin epoxide with a certain epoxy value and a small molecular weight is obtained by the catalysis of DMAP for the macromolecular lignin. It was discovered that compared to the prepared composite resin of benzyltriethylammonium chloride (BTEAC)-lignin epoxide, there is a better low-temperature storage modulus for the DMAP-lignin epoxide resin and its composite resins with high-biomass contents, and higher tensile strength for its composite resins. In particular, the DMAP-lignin epoxide/ bisphenol A diglycidyl ether (BADGE) (DB) composite resin with DMAP-lignin epoxide replacement of 80 wt% BADGE, containing up to 58.0 wt% the lignin epoxide, exhibits the tensile strength of 76.3 ± 3.2 MPa. Its tensile strength is 110.2% of BTEAC-lignin epoxide/BADGE (BB) composite resins and is comparable to that of petroleum-based epoxy resins. There are good application prospects for the DB composite resin in the engineering plastics, functional composite, grouting, and other fields.

APA, Harvard, Vancouver, ISO, and other styles

46

Zhang, Lichen, Deqi Yi, and Jianwei Hao. "Poly(diallyldimethylammonium) and polyphosphate polyelectrolyte complex as flame retardant for char-forming epoxy resins." Journal of Fire Sciences 38, no. 4 (March 20, 2020): 333–47. http://dx.doi.org/10.1177/0734904120911722.

Full text

Abstract:

The flame retardant poly(diallyldimethylammonium) and polyphosphate polyelectrolyte complex and the curing agent m-Phenylenediamine were blended into diglycidyl ether of bisphenol A (DGEBA)-type epoxy resin to prepare flame-retardant epoxy resin thermosets. The effects of poly(diallyldimethylammonium) and polyphosphate on fire retardancy and thermal degradation behavior of epoxy resins (EP)/poly(diallyldimethylammonium) and polyphosphate composites were tested by Limiting Oxygen Index, UL-94, cone calorimeter tests, and thermogravimetric analysis and compared with pure EP. The results showed that the Limiting Oxygen Index value of EP/poly(diallyldimethylammonium) and polyphosphate composite could reach 31.9%, and UL-94 V-0 rating at 10 wt% poly(diallyldimethylammonium) and polyphosphate loading. Meanwhile the cone calorimetry peak heat release rate and total heat release were reduced up to 55.2% and 21.8%, respectively; smoke production rate and total smoke production were also declined significantly, compared with those of pure epoxy resins. Poly(diallyldimethylammonium) and polyphosphate played a very good flame-retardant effect on epoxy resins.

APA, Harvard, Vancouver, ISO, and other styles

47

Wu, Xiaoli, Chunlei Dong, Alvianto Wirasaputra, Haohao Huang, Shumei Liu, Jianqing Zhao, and Yi Fu. "Imparting high flame retardancy to epoxy resin with ultra-low loading of 5,10-dihydro-phenophosphazine-10-oxide functioned triazine." High Performance Polymers 30, no. 6 (August 3, 2017): 742–51. http://dx.doi.org/10.1177/0954008317723083.

Full text

Abstract:

High mechanical properties and flame retardancy of epoxy are important for its applications. A novel star-shaped flame-retardant 5,10-dihydro-phenohphosphazine-10-oxide functioned triazine (TRIDPPA) with high efficiency is synthesized, and its structure is characterized. TRIDPPA is used as the co-curing agent for diglycidyl ether of the bisphenol A/4,4-diaminodiphenyl methane system. The introduction of TRIDPPA greatly improves the flame retardancy of the cured epoxy resins. The epoxy resin (ER)/TRIDDPA1.0 resin acquires a limiting oxygen index value of 30.7% and UL-94 V-0 rating when the mass fraction of TRIDDPA is 1.0 wt% with only 0.086 wt% of phosphorus content. The cross-link density of ER/TRIDDPA1.0 is increased, and the glass transition temperature is improved by 5°C. Besides, tensile strength and toughness of ER/TRIDDPA1.0 are also enhanced.

APA, Harvard, Vancouver, ISO, and other styles

48

Khatiwada, Shankar P., Sabu Thomas, Jean Marc Saiter, Ralf Lach, and Rameshwar Adhikari. "Mechanical and thermal properties of triblock copolymer modified epoxy resins." BIBECHANA 16 (November 22, 2018): 196–203. http://dx.doi.org/10.3126/bibechana.v16i0.21651.

Full text

Abstract:

We investigate the ways of improving thermal and mechanical properties of diglycidyl ether of bisphenol-A (DGEBA) based thermoset resin using diaminodiphenylsulphone (DDS) as hardener and using epoxidized polystyrene/polybutadiene-based triblock copolymers as modifier. The epoxidation was performed. The targeted chemical modification using meta-chloroperoxybenzoic acid (m-CPBA) of the copolymer was performed whereby the epoxidation of the butadiene chains mainly took place at 1,4 linkages. The modification copolymer was found to contribute in enhancing the mechanical performance of the blends with epoxy resin. The results indicated the formation of nanostructured morphology in the blends attributable to their enhanced impact strength.BIBECHANA 16 (2019) 196-203

APA, Harvard, Vancouver, ISO, and other styles

49

Moller, James C., Rajiv J. Berry, and Heather A. Foster. "On the Nature of Epoxy Resin Post-Curing." Polymers 12, no. 2 (February 18, 2020): 466. http://dx.doi.org/10.3390/polym12020466.

Full text

Abstract:

Post-curing is intended to improve strength, elevate glass transition, and reduce residual stress and outgassing in thermosets. Also, experiments indicate post-curing temperatures lead to ether crosslinks and backbone dehydration. These results informed molecular dynamics methods to represent them and compare the resulting thermomechanical effects. Diglycidyl ether of bisphenol A (DGEBA)-diamino diphenyl sulfone (DDS) systems were examined. Independent variables were resin length, stoichiometry, and reaction type (i.e., amine addition, etherification, and dehydration). Etherification affected excess epoxide systems most. These were strengthened and became strain hardening. Systems which were both etherified and dehydrated were most consistent with results of post-curing experiments. Dehydration stiffened and strengthened systems with the longer resin molecules due to their intermediate hydroxyl groups for crosslinking. Changes in the concavity of functions fit to the specific volume versus temperature were used to detect thermal transitions. Etherification generally increased transition temperatures. Dehydration resulted in more transitions.

APA, Harvard, Vancouver, ISO, and other styles

50

Vyhnánková, Michaela, Jakub Hodul, and Jiří Bydžovský. "Issue of Epoxy-Based Coatings System Crystallization and Effect of Partial Crystallinity on Mechanical Parameters." Key Engineering Materials 776 (August 2018): 147–52. http://dx.doi.org/10.4028/www.scientific.net/kem.776.147.

Full text

Abstract:

Crystallization of bisphenol A-based and bisphenol F-based epoxy resins is the common property of the oligomers. However, producers of paints, coatings and other systems based on these epoxy resins are making efforts to slow down the crystallization process as much as possible. Thereby the shelf life is prolonged, while improving the competitiveness of their products. The main topic is the generalization of factors influencing the crystallization process of bisphenol A-based and bisphenol F-based epoxy resins, the validation of new approaches to possibility of influencing their crystallization process, and the determination of possibility of using a certain degree of crystallinity of bisphenol A-based and bisphenol F-based epoxy resins when preparing and producing paint and coating systems. Two types of the epoxy resins in formulations of paint and coating and other systems, namely: diglycidyl ether of bisphenol A (DGEBA) and diglycidyl ether of bisphenol F (DGEBF) were used. The tendency to crystallize not only for the pure epoxy resins, but also various mixtures with reactive diluents, fillers, etc. was determined according to the standard ISO 4895 Plastics – Liquid epoxy resins – Determination of tendency to crystallize. Furthermore, the crystallinity of individual samples was determined. The effectiveness of potentially active nucleating agents such as precipitated calcium carbonate, DGEBA, and DGEBF crystals, etc. was selected and tested according to the ISO 4895 standard. The effectiveness of potentially active admixtures with crystallization retardation effect was selected and tested according to the ISO 4895 standard. Selected samples of the epoxy resins with a specified degree of crystallinity were cured with 3-aminomethyl-3,5,5-trimethylcyclohexylamine (IPD) based crosslinking agent. Mechanical parameters such as compressive strength and flexural strength were determined. The influence of crystallinity on selected mechanical parameters was also observed.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Bisphenol-A diglycidyl ether resin'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles