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Literatura académica sobre el tema "Epoxy resins – Thermomechanical properties"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 10 de febrero de 2022

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Artículos de revistas sobre el tema "Epoxy resins – Thermomechanical properties"

Yu, Seoyoon, Wonjoo Lee, Bongkuk Seo y Chung-Sun Lim. "Synthesis of Benzene Tetracarboxamide Polyamine and Its Effect on Epoxy Resin Properties". Polymers 10, n.º 7 (16 de julio de 2018): 782. http://dx.doi.org/10.3390/polym10070782.

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Epoxy resins have found various industrial applications in high-performance thermosetting resins, high-performance composites, electronic-packaging materials, adhesives, protective coatings, etc., due to their outstanding performance, including high toughness, high-temperature performance, chemical and environmental resistance, versatile processability and adhesive properties. However, cured epoxy resins are very brittle, which limits their applications. In this work, we attempted to enhance the toughness of cured epoxy resins by introducing benzene tetracarboxamide polyamine (BTCP), synthesized from pyromellitic dianhydride (PMDA) and diamines in N-methyl-2-pyrrolidone (NMP) solvent. During this reaction, increased viscosity and formation of amic acid could be confirmed. The chemical reactions were monitored and evidenced using 1H-NMR spectroscopy, FT-IR spectroscopy, water gel-phase chromatography (GPC) analysis, amine value determination and acid value determination. We also studied the effect of additives on thermomechanical properties using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamical mechanical analysis (DMA), thermomechanical analysis (TMA) and by measuring mechanical properties. The BTCP-containing epoxy resin exhibited high mechanical strength and adhesion strength proportional to the amount of BTCP. Furthermore, field-emission scanning electron microscopy images were obtained for examining the cross-sectional morphology changes of the epoxy resin specimens with varying amounts of BTCP.

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Das, Abhishek y Gautam Sarkhel. "Effect of stoichiometric ratios for synthesized epoxy phenolic novolac (EPN) resins on their physicochemical, thermomechanical and morphological properties". Pigment & Resin Technology 45, n.º 4 (4 de julio de 2016): 265–79. http://dx.doi.org/10.1108/prt-08-2014-0060.

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Purpose The purpose of this paper is to study the effect of various stoichiometric ratios for synthesised epoxy phenolic novolac (EPN) resins on their physicochemical, thermomechanical and morphological properties. Design/methodology/approach In the present study, EPN (EPN-1, EPN-2, EPN-3, EPN-4 and EPN-5) resins were synthesised by varying five types of different stoichiometric ratios for phenol/formaldehyde along with the corresponding molar ratios for novolac/epichlorohydrin. Their different physicochemical properties of interest, thermomechanical properties as well as morphological properties were studied by means of cured samples with the variation of its stoichiometric ratios. Findings The average functionality and reactivity of EPN resin can be controlled by controlling epoxy equivalence as well as cross-linking density upon its curing as all of these factors are internally correlated with each other. Research limitations/implications Epoxy resins are characterised by a three-membered ring known as the epoxy or oxirane group. The capability of the epoxy ring to react with a variety of substrates imparts versatility to the resin. However, these resins have a major drawback of low toughness, and they are also very brittle, which limits their application in products that require high impact and fracture strength. Practical implications Epoxy resins have been widely used as high-performance adhesives and matrix resins for composites because of their outstanding mechanical and thermal properties. Because of their highly cross-linked structure, the epoxy resin disables segmental movement, making them hard, and it is also notch sensitive, having very low fracture energy. Social implications Epoxy resin is widely used in industry as protective coatings and for structural applications, such as laminates and composites, tooling, moulding, casting, bonding and adhesives. Originality/value Systematic study has been done for the first time, as no exact quantitative stoichiometric data for the synthesis of EPN resin were available on the changes of its different properties. Thus, an optimised stoichiometric composition for the synthesis of the EPN resin was found.

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Zhou, Haoran, Xupeng Fan, Changwei Liu, Chunyan Qu, Zhen Yuan, Jiaqi Jing, Yao Tang, Daoxiang Zhao, Wanbao Xiao y Kai Su. "Properties of high-temperature epoxy/DDS resin systems for bonding application". High Performance Polymers 32, n.º 5 (22 de noviembre de 2019): 559–68. http://dx.doi.org/10.1177/0954008319888002.

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The choice of basic epoxy resin (ER) is especially important for the design of epoxy adhesive formulations. In the present study, performance of several high-temperature ER systems, prepared using 4,4-diaminodiphenylsulfone as the curing agent by the same curing process, was investigated. The curing behavior was studied by dynamic rheometry and differential scanning calorimetry. The thermal properties of the cured resins were investigated by dynamic thermomechanical analysis, thermomechanical analysis, and thermogravimetric analysis. The peeling properties, mechanical behaviors, and moisture absorptivities of the cured resins were also studied. The results showed traditional diglycidyl ether of bisphenol A epoxy to be insufficient in heat resistance. Naphthalene-based ER and bifunctional cardo ER showed higher glass transition temperature values. However, the processability and adhesive properties may not comply with the application requirements. Biphenyl novolac ER has excellent performance in all aspects, which is suitable for use as a high-temperature adhesive.

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Rimdusit, Sarawut, Pathomkorn Kunopast y Isala Dueramae. "Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin". Polymer Engineering & Science 51, n.º 9 (11 de abril de 2011): 1797–807. http://dx.doi.org/10.1002/pen.21969.

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Lo, Jonathan, Xingyue Zhang, Travis Williams y Steven Nutt. "Eliminating porosity via reformulation of a benzoxazine–epoxy resin transfer molding resin". Journal of Composite Materials 52, n.º 11 (29 de agosto de 2017): 1481–93. http://dx.doi.org/10.1177/0021998317727048.

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Use of benzoxazine resins in composites is limited by volatile-induced porosity, which degrades the thermomechanical properties of the product. In the present study, we demonstrate how to eliminate cure-induced volatilization and volatile-induced defects in benzoxazine composite laminates, using a chemistry-based approach. Like most resins formulated for high-temperature service, benzoxazine and benzoxazine–epoxy blends generally include solvent additives. Consequently, composite parts produced with such resins exhibit higher levels of cure-induced volatile release, often leading to porosity in the final manufactured part. Here, we develop a method to eliminate porosity by analyzing volatile release and the effects of residual solvent in a pre-commercial benzoxazine–epoxy system designed for liquid molding by resin transfer molding. Utilizing thermogravimetric analysis, nuclear magnetic resonance spectroscopy, and dynamic mechanical analysis, we correlate the concentration of residual solvent remaining within the final manufactured part with the Tg, degradation temperature, and dynamic modulus. Lastly, a resin synthesis method is demonstrated that eliminates residual solvent in order to produce composite parts with optimal surface finish and thermomechanical properties. The report outlines a methodology for optimizing blended resin chemistry for production of high-quality composite parts.

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Atta, Ayman M., Hamad A. Al-Lohedan, Abdelrahman O. Ezzat y Nourah I. Sabeela. "New Imidazolium Ionic Liquids from Recycled Polyethylene Terephthalate Waste for Curing Epoxy Resins as Organic Coatings of Steel". Coatings 10, n.º 11 (23 de noviembre de 2020): 1139. http://dx.doi.org/10.3390/coatings10111139.

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Imidazolium ionic liquid (IIL) was prepared from aminolysis of polyethylene terephthalate (PET) waste with pentaethylenehexamine (PEHA) to apply as hardener of epoxy resin. Its purified chemical structures, thermal stability, and thermal characteristics were identified as well as amino phthalamide aminolyzed products. The thermal, thermomechanical, and mechanical properties of the cured epoxy resins with different weight percentages of IIL were investigated to optimize the best weight ratio to obtain homogeneous networks. The adhesion, durability, and corrosion resistance of the cured epoxy resins on the steel surfaces were tested to confirm that the best weight ratio of epoxy: IL was 2:1. This ratio achieved higher adhesion strength and salt spray resistance to seawater extended to 1500 h.

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Cui, Yu Qing y Zhong Wei Yin. "Carbon-fibre-reinforced modified cyanate ester winding composites and their thermomechanical properties". High Performance Polymers 31, n.º 2 (21 de enero de 2018): 154–67. http://dx.doi.org/10.1177/0954008317753526.

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Although the extensive research has expanded on the modification of cyanate ester (CE) resins and the mechanical properties of CE composites, very few studies have been conducted on carbon fibre (CF)/modified CE winding composites and the thermomechanical properties of the composites. In this research, epoxy (EP)-modified novolac cyanate ester (NCE) and bismaleimide (BMI)-modified NCE resins were prepared. The CF/modified CE winding composites were manufactured, and their thermomechanical properties were tested. The optimal winding process was determined, and a preheating technique was implemented. Then, the EP/CE resin (10:90) and the BMI–DBA/CE resin (10:90) were selected as the resin matrix of the winding composite based on the viscosity properties, mechanical properties and thermal analysis (using thermogravimetric analysis and differential scanning calorimetry) of the modified CE resin. The selected resin exhibited good manufacturability at 70°C, good thermal stability and high Tg (above 370°C). The thermomechanical property tests indicate that the modified CE resin composite exhibits an outstanding mechanical strength at room temperature and at high temperatures (130°C, 150°C and 180°C) compared with that of the pure CE resin composite. The reasons for this enhancement can be attributed to a toughening mechanism and the effect of sizing agents on the CFs.

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Kinaci, Emre, Erde Can, John Scala y Giuseppe Palmese. "Influence of Epoxidized Cardanol Functionality and Reactivity on Network Formation and Properties". Polymers 12, n.º 9 (29 de agosto de 2020): 1956. http://dx.doi.org/10.3390/polym12091956.

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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.

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Gouda, Krushna, Sumit Bhowmik y Biplab Das. "A review on allotropes of carbon and natural filler-reinforced thermomechanical properties of upgraded epoxy hybrid composite". REVIEWS ON ADVANCED MATERIALS SCIENCE 60, n.º 1 (1 de enero de 2021): 237–75. http://dx.doi.org/10.1515/rams-2021-0024.

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Abstract The scarcity of nonrenewable resource motivated inclination towards the environmental-friendly novel materials and development of waste natural filler-based hybrid composite is encouraged to fulfill the material demand. Epoxy resins-based composites are high-performing thermosetting polymers and have outstanding blending properties, good machinability, and low cost. Due to these advantages, thermoset plastic is largely used in a broad range of engineering applications; however, thermomechanical properties of neat epoxy are low. Thus, to enhance the thermomechanical properties of epoxy, it is interfaced materials such as graphite, graphene nanoplatelet, boron, carbon fiber, aluminium, silver, etc. Among various substances, graphene has been deliberated as an acceptable novel filler because of its exceptional properties. In addition to inorganic filler inclusion, natural filler/fiber like hemp, sisal, flax, bamboo, jute, etc. can be utilized in a higher percentage as biodegradable material. The present article assisted to improve thermomechanical properties of neat epoxy. This work identifies and addresses (i) processes used for graphene modification; (ii) treatment utilized for enhancing the binding properties of natural filler; (iii) various natural filler extraction process employed; (iv) neat epoxy modification; and (v) influence of different dimensions of fillers.

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Karami, Z., MJ Zohuriaan-Mehr, K. Kabiri y N. Ghasemi Rad. "Bio-based thermoset alloys from epoxy acrylate, sesame oil- and castor oil-derived resins: Renewable alternatives to vinyl ester and unsaturated polyester resins". Polymers from Renewable Resources 10, n.º 1-3 (febrero de 2019): 27–44. http://dx.doi.org/10.1177/2041247919863633.

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This study deals with the synthesis of vegetable oil (VO)-derived formulated resins with high bio-based content (30–77%) as potential renewable alternatives to conventional fossil-based vinyl ester (VE) and unsaturated polyester (UP) resins. First, epoxy acrylate was synthesized from a commercial epoxy resin via acrylation with acrylic acid. Then, acrylated epoxidized sesame oil (AESSO) and maleated castor oil (MCO) were synthesized and spectrally characterized. Afterward, networks of VE, AESSO, and MCO or their binary blends were prepared. The curing trend of the resins was investigated by differential scanning calorimetry. According to thermal and thermomechanical analysis, all of the VO-based networks possessed slightly inferior properties compared to those of VE. However, the adhesion strength of the VO-based alloying systems was higher than that of their petroleum-based counterpart based on T-peel and lap shear tests. Overall, it was concluded that the bio-resourced alloys could be considered as good alternatives to VE and UP resins, and the novel bio-resin formulations may be designed for adhesives, the polymer–matrix composites, and surface coating applications.

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Tesis sobre el tema "Epoxy resins – Thermomechanical properties"

Adhikari, Kamal. "Effects of functionalized single walled carbon nanotubes on the processing and mechanical properties of laminated composites". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99617.

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Carbon Nanotubes are thought to have tremendous potential as reinforcements for the next generation of composite materials. In the past decade, the enhancing effects of the nanotubes on the mechanical, electrical as well as multi-functional properties of polymer composites have been reported. However, the same nanotubes/polymer composites investigated by different research groups, in many cases, do not show a good agreement with one another. The root cause of this variability is believed to lie in the processing methodology employed to prepare the composites. Before one can propose an ideal and systematic processing condition, it is imperative to have a fundamental understanding of the effect of these nanotubes on the processing of the nanotube-based composites. In this study, the effect of 0.2wt.% functionalized single walled carbon nanotubes on the various thermo mechanical and thermo chemical properties of aerospace grade epoxy was investigated. Namely, the thermal degradation, rheological behavior, cure kinetics as well as the thermal expansion behavior of the epoxy were addressed. In addition, the effect of the application small quantity of nanotube/epoxy composite film on the interlaminar shear strength (ILSS) of a conventional laminated carbon fibre/epoxy prepregs was also investigated. The characterization results show that the presence of the nanotubes has a very significant effect on some of the inherent physical and chemical properties of the epoxy. The presence of these nanotubes leads to a delay in the degradation temperature of the epoxy. The viscosity sees a seven-fold increase at room temperature and the resin also gels at a lower temperature in the presence of the nanotubes. At the same time, the total heat of reaction is also lowered on addition of the nanotubes. The mechanical test, however, shows that the addition of the nanotube/epoxy film does not affect the ILSS of the laminated carbon fibre/epoxy composite. This ILSS value is also found to be dependant on the controlled alignment of the nanotubes and the method of application of the film at the interfaces of the laminates. Finally, it was observed that the nanotubes, when used in such low contents, also had no effect on the thermo mechanical properties of the epoxy.
Les nanotubes de carbone sont considérés comme ayant un potentielénorme pour assurer le rôle de renforts dans la prochaine génération de matériauxcomposites. Dans les décennies précédentes, les effets des nanotubes surl'amélioration des propriétés mécaniques, électriques et multi-fonctionnelles despolymères ont été révélés. Par contre, dans la plupart des cas, les études réaliséespar différents groupes de recherche et portant sur les mêmes composites faits depolymère renforcé de nanotubes ne présentent pas toutes des résultatscomparables. La cause majeure de cette variabilité est la méthodologie utiliséelors du procédé de fabrication de ces composites. Avant que quiconque ne suggèreune méthodologie idéale et systématique, il est impératif de comprendre les basesfondamentales de l'effet des nanotubes sur le procédé de fabrication. Dans cetterecherche, les effets des nanotubes de carbone à paroi simple sur les propriétésthermo mécaniques et thermo chimiques d'une résine époxy de gradeaéronautique ont été investigués. Les caractéristiques étudiées comprennent ladégradation thermique, le comportement rhéologique, la cinétique depolymérisation, ainsi que l'expansion thermique. L'effet de l'application d'unfilm de nanotube/époxy sur la résistance interlaminaire au cisaillement aégalement été étudié avec un préimprégné conventionel de fibre de carbone etd'époxy. Les résultats de caractérisation montrent que les nanotubes ont un effetsignificatif sur certaines propriétés physiques et chimiques inhérentes à l'époxy.La présence des nanotubes crée un délai dans la température de dégradation del'époxy. La viscosité de la résine est 7 fois plus élevée à la température de la pièceet sa température de gélification est inférieure. De plus, la chaleur totale deréaction est diminuée. Par contre, les tests mécaniques montrent que l'applicationd'un film de nanotube/époxy ne cause pas de changement dans la résistanceinterlaminaire au cisaillement d'un préimprégné de fibre de carbone et d'époxy.Par ailleurs, cette valeur de résistance est dépendante de l'alignement desnanotubes et de la méthode d'application du film sur les interfaces du laminé.Finalement, il a été observé que les nanotubes n'ont aucun effet sur les propriétésthermo mécaniques.

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Sharma, Bed P. "Effect of sonication on thermal, mechanical, and thermomechanical properties of epoxy resin /". Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1966551531&sid=3&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Sharma, Bed Prasad. "Effect of sonication on thermal, mechanical, and thermomechanical properties of epoxy resin". OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/113.

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Epoxy resin is an important engineering material in many industries such as electronics, automotive, aerospace, etc not only because it is an excellent adhesive but also because the materials based on it provide outstanding mechanical, thermal, and electrical properties. Epoxy resin has been proved to be an excellent matrix material for the nanocomposites when including another phase such as inorganic nanofillers. The properties of a nanocomposite material, in general, are a hybrid between the properties of matrix material and the nanofillers. In this sense, the thermal, mechanical, and electrical properties of a nanocomposite may be affected by the corresponding properties of matrix material. When the sonication is used to disperse the nanofillers in the polymer matrix, with the dispersal of the nanofillers, there comes some modification in the matrix as well and it finally affects the properties of nanocomposites. In this regard, we attempted to study the thermal, mechanical, and dynamic properties of EPON 862 epoxy resin where ultrasonic processing was taken as the effect causing variable. Uncured epoxy was subjected to thermal behavior studies before and after ultrasonic treatment and the cured epoxies with amine hardener EPICURE 3223 (diethylenetriamine) after sonications were tested for mechanical and dynamic properties. We monitored the ultrasonic processing effect in fictive temperature, enthalpy, and specific heat capacity using differential scanning calorimetry. Fictive temperature decreased whereas enthalpy and specific heat capacity were found to increase with the increased ultrasonic processing time. Cured epoxy rectangular solid strips were used to study the mechanical and dynamic properties. Flexural strength at 3% strain value measured with Dillon universal testing machine under 3-point bending method was found to degrade with the ultrasonic processing. The storage modulus and damping properties were studied for the two samples sonicated for 60 minutes and 120 minutes. Our study showed that the 60 minutes sonicated sample has higher damping or loss modulus than 120 minutes sonicated sample.

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Gilbert, A. H. "Toughening tetrafunctional epoxy resins with thermoplastics". Thesis, Cranfield University, 1988. http://dspace.lib.cranfield.ac.uk/handle/1826/10722.

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The study described in this thesis examines how modification with different thermoplastics affects the structure and properties of a tetrafunctional epoxy re5ín_ Polyetherimide (PEI) is found to give the best improvement in fracture properties without loss in Youngs Modulus and the PEI/epoxy system is used as the basis for further study. The influences of PEI concentration, initial cure temperature, test temperature and the presence of a second thermoplastic additive, are investigated. The information provided gives insight into the likely mechanisms of toughening in tetrafunctional epoxy/thermoplastic blends. Flory-Huggins Lattice Theory is used to describe miscibility behaviour for a number of curing thermoplastic/epoxy blends and the predictions compared with the actual morphologies observed. Further, the sensitivity of the expected miscibility behaviour to fluctuations in Flory Huggins interaction parameter X12 and number-average molecular weight Mn of the thermoplastic, is considered. Dynamic mechanical analysis is used to monitor the changing viscoelastic properties of curing thermoplastic/epoxy blends, allowing investigation of the way different thermoplastics influence the state transformation profile of a curing epoxy resin.

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Thota, Phanindra. "Electrical Properties of Copper Doped Curcuminated Epoxy Resins". Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1337031967.

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Ottemer, Xavier. "Effects of processing and environmental conditions on the properties of epoxy materials". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/18383.

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Hofmann, Klaus. "Synthesis, properties, and morphology of lignin based epoxy resins". Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37407.

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Star-like lignin-poly(propylene oxide) copolymers were prepared by chain-extending steam exploded lignins (tulipifera liriodendron) with propylene oxide and by subsequent endcapping with ethylene oxide. Epoxidation of these copolymers was carried out with epichlorohydrin at room temperature, using KOH as oxyanion forming reagent. The epoxidized compounds were fractionated by solvent precipitation to remove poly(alkylene oxide) homopolymers and to prepare fractions of narrow molecular weight distributions. The epoxides were cross-linked with meta phenylene diamine yielding thermosets which were, depending on lignin content, either low modulus elastomers, or high modulus materials with considerable ductility. The modulus of elasticity was a strong and linear function of lignin content, whereby the highest value was 1100MPa (57% lignin). The curing reaction was of nth-order type, whereby the reaction order changed from close to one at the beginning of the curing reaction to 2, once the reaction becomes diffusion controlled. Curing induced partial demixing of the lignin and poly(propylene oxide) phases which yielded a secondary structure where lignin rich domains in the order of 10 nm were interspersed in a matrix of lignin poor material. However, from TEM and ¹³C solid state cross-polarized NMR analyses it was evident that the domain structure was not that of a classical micro-phase separated copolymer with well defined phase boundaries, but rather had broad interphases. Additionally, the results of multifrequency dynamic mechanical thermal analysis showed that the lignin containing thermosets have very broad glass transition ranges which most likely were due to transitional phase inhomogeneities and provided these materials with good vibrational damping ability.
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Thitipoomdeja, Somkiat. "Factors influencing the properties of epoxy resins for composite applications". Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/10852.

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The aim of the work reported here was to determine the influence of an amine curing agent, and postcure cycle on the mechanical and thermal properties of diglycidyl ether of bisphenol A (DGEBA) epoxy resin. The results of this initial study were then used as the basis for selecting material to obtain optimum toughness in epoxy/glass fibre systems. These basic materials were further used to make comparisons with the properties of modified resin systems which contained commercial elastomers. Differential Scanning Calorimetry (DSC), Dynamic Mechanical Thermal Analysis (DMTA), Fourier Transform Infrared Spectroscopy (FTIR), flexural and interlaminar shear tests, Instrumented Falling Weight Impact (IFWI), visual observation, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) were all used to investigate various properties and the structures which gave rise to them. The properties of cured products were found to be affected by the amounts of curing agent, curing times and temperatures, and the structure of the elastomers. Not surprisingly the maximum thermal and mechanical properties tended to be found in the stoichiometric (standard) mix systems. However, postcuring at higher than room temperature, which was used as the basic curing temperature, led to more conversion. This effect improved the thermal and mechanical properties of both the unmodified and modified resin systems. The maximum flexural strength of 104 MPa of the unreinforced resins was found in the stoichiometric mix ratio after postcure at 150°C for 4 hr. However, the maximum flexural modulus and glass transition temperature (Tg) were found after postcuring at the same temperature for 48 hr. This was believed to be due to increased crosslinking, but unfortunately the longer curing time led to degradation of the resins. In the systems modified with -20 phr of polyetheramine elastomers, the one modified with the lowest molecular weight (2000) was found to have the highest flexural strength (85.8 MPa) and modulus (2.5 GPa). The impact properties of all the composites with modified resin matrices were found to be higher than the unmodified resin matrix composites. The best impact properties were, however, obtained with the elastomer modifier with a molecular weight of 4000. The impact energy at maximum force increased from 11.9 to 16.4 J, and energy at failure increased from 18.7 to 21.6 J. This increase in impact properties was due to the increase in areas of phase separated elastomer particles over similar systems with lower molecular weight modifier.

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Balasubramani, Praveen Kumar. "Properties and Curing Kinetics of Epoxy Resins Cured by Chitosan". University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1480328803855009.

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Greenfield, C. L. "The cure characteristics and physical properties of glycidyl-ether epoxy resins". Thesis, Brunel University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381904.

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Libros sobre el tema "Epoxy resins – Thermomechanical properties"

Dow, Marvin B. Properties of two composite materials made of toughened epoxy resin and high-strain graphite fiber. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Greenfield, David C. L. The cure characteristics and physical properties of glycidyl-ether epoxy resins. Uxbridge: Brunel University, 1988.

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Rule, D. L. Low-temperature thermal conductivity of composites: Alumina fiber/epoxy and alumina fiber/PEEK. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1989.

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Rule, D. L. Low-temperature thermal conductivity of composites: Alumina fiber/epoxy and alumina fiber/PEEK. Boulder, Colo: U.S. Dept. of Commerce, National Bureau of Standards, 1989.

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Rule, D. L. Low-temperature thermal conductivity of composites: Alumina fiber/epoxy and alumina fiber/PEEK. Boulder, Colo: U.S. Dept. of Commerce, National Bureau of Standards, 1989.

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Rule, D. L. Low-temperature thermal conductivity of composites: Alumina fiber/epoxy and alumina fiber/PEEK. Boulder, Colo: U.S. Dept. of Commerce, National Bureau of Standards, 1989.

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Evans, R. W. Test report: Fault current through graphite filament reinforced plastic. MSFC, Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1997.

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Evans, R. W. Design guidelines for shielding effectiveness, current carrying capability, and the enhancement of conductivity of composite materials. Marshall Space Flight Center, Ala: National Aeronautics and Space Administration, [George C. Marshall Space Flight Center, 1997.

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J, Bowles Kenneth y United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. A predictive model for failure properties of thermoset resins. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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Capítulos de libros sobre el tema "Epoxy resins – Thermomechanical properties"

Johari, G. P. "Electrical properties of epoxy resins". En Chemistry and Technology of Epoxy Resins, 175–205. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2932-9_6.

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Milios, J., V. Kefalas, E. Sideridis y G. Spathis. "Dynamic Properties of Epoxy Resins". En Handbook of Ceramics and Composites, 137–77. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003210085-6.

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Kamon, Takashi y Hitoshi Furukawa. "Curing mechanisms and mechanical properties of cured epoxy resins". En Advances in Polymer Science, 173–202. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/3-540-16423-5_15.

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Storey, Robson F., Sudhakar Dantiki y J. Patrick Adams. "Properties of Epoxy Resins Cured with Ring-Alkylatedm-Phenylene Diamines". En ACS Symposium Series, 182–98. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0367.ch014.

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Moriyama, Hideshige, Yoshiyuki Inoue, Hisayasu Mitsui, Yoshinao Sanada y Yoshio Kobayashi. "Several Properties of Impregnating Epoxy Resins Used for Superconducting Coils". En Materials, 339–46. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4757-9050-4_43.

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Adachi, Tadaharu, Markus Karamoy Umboh, Tadamasa Nemoto, Masahiro Higuchi y Zoltan Major. "Mechanical Properties of Epoxy Resins Filled with Nano-Silica Particles". En Dynamics and Control of Advanced Structures and Machines, 225–34. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43080-5_25.

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Philippenko, A. M., L. N. Mashlyakowsky, A. V. Ilyinykh y A. G. Morozov. "Effect of Infrared Laser Radiation on Curing and Properties of Epoxy Resins". En MICC 90, 289–94. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3676-1_46.

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Jabbar, Abdul, Jiří Militký, Azam Ali y Muhammad Usman Javed. "Investigation of Mechanical and Thermomechanical Properties of Nanocellulose Coated Jute/Green Epoxy Composites". En Advances in Natural Fibre Composites, 175–94. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64641-1_16.

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Thangamathesvaran, P. M. y Sampat R. Jain. "Synthesis, Characterization and Binding Properties of Epoxy Resins Based on Carbonohydrazones and Thiocarbonohydrazones". En Frontiers of Polymer Research, 589–94. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3856-1_66.

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Amendola, E., C. Carfagna y M. Giamberini. "Role of Curing Agent on the Nature of the Mesophase and the Properties of Mesogenic Epoxy Resins". En ACS Symposium Series, 389–404. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0632.ch023.

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Actas de conferencias sobre el tema "Epoxy resins – Thermomechanical properties"

Hossain, Mohammad K., Md Mahmudur R. Chowdhury, Mahesh Hosur y Nydeia W. Bolden. "Viscoelastic Properties of Carbon/Epoxy Amino-Functionalized Graphene Nanoplatelet Composite". En ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67856.

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A systematic study was conducted on processing and characterizing of the carbon fiber reinforced epoxy polymer (CFRP) composite to enhance its viscoelastic and thermal properties through the integration of an optimized amount of amino-functionalized graphene nanoplatelet (NH2-GNP). Epoxy resin, EPON 828, was modified through the integration of 0.1–0.5 wt% of NH2-GNP as a reinforcing agent. The GNP was infused into the resin using a high intensity ultrasonic processor followed by a three roll milling for better dispersion. Epikure 3223 curing agent was then added to the modified resin and mixed using a high-speed mechanical stirrer. The nanophased epoxy was then used to fabricate CFRP nanocomposites using the compression molding process. Dynamic mechanical analysis (DMA) and thermomechanical analysis (TMA) were performed to analyze viscoelastic and thermal performances of these composites. In all cases, 0.4 wt% GNP-infused epoxy nanocomposite exhibited the best properties. The 0.4 wt% GNP modified carbon fiber/epoxy composites showed 19% and 23% improvement in storage modulus and loss modulus, respectively. Glass transition temperature (Tg) was improved by 16% maximum at 0.4 wt% GNP loading due to better interfacial interaction and effective load transfer between NH2-GNP and epoxy resin. Moreover, there were about 13% and 28% reduction in the coefficient of thermal expansion (CTE) before and after Tg, respectively.

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Mahdi, Tanjheel H., Mohammad E. Islam, Mahesh V. Hosur, Alfred Tcherbi-Narteh y S. Jeelani. "Characterization of Mechanical and Viscoelastic Properties of SC-15 Epoxy Nanocomposites Reinforced With Multi-Walled Carbon Nanotubes, Nanoclay and Binary Nanoparticles". En ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36176.

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Mechanical and viscoelastic properties of polymer nanocomposites reinforced with carboxyl functionalized multiwalled carbon nanotubes (COOH-MWCNT), montmorillonite nanoclays (MMT) and MWCNT/MMT binary nanoparticle were investigated. In this study, 0.3 wt. % of COOH-MWCNT, 2 wt. % of MMT and 0.1 wt. % COOH-MWCNT/2 wt. % MMT binary nanoparticles by weight of epoxy were incorporated to modify SC-15 epoxy resin system. The nanocomposites were subjected to flexure test, dynamic mechanical and thermomechanical analyses. Morphological study was conducted with scanning electron microscope. Addition of each of the nanoparticles in epoxy showed significant improvement in mechanical and viscoelastic properties compared to those of control ones. But, best results were obtained for addition of 0.1% MWCNT/2% MMT binary nanoparticles in epoxy. Nanocomposites modified with binary nanoparticles exhibited about 20% increase in storage modulus as well as 25° C increase in glass transition temperature. Flexural modulus for binary nanoparticle modified composites depicted about 30% improvement compared to control ones. Thus, improvement of mechanical and viscoelastic properties was achieved by incorporating binary nanoparticles to epoxy nanocomposites. The increase in properties was attributed to synergistic effect of MWCNTs and nanoclay in chemically interacting with each other and epoxy resin as well as in arresting and delaying the crack growth once initiated.

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McClung, Amber J. W., Joseph A. Shumaker y Jeffery W. Baur. "Novel Bismaleimide-Based Shape Memory Polymers: Comparison to Commercial Shape Memory Polymers". En ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5044.

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A series of novel shape memory polymers, synthesized from 4-4-bismaleimidodiphenyl-methane, an extended chain aliphatic diamine, and a bis-isocyanate, have been created and characterized with the aim of providing a family of robust high temperature shape memory polymers with tailorable transition temperatures for use in reconfigurable aerospace structures. In the present study, three of the polymers are chosen for more detailed study of their thermomechanical properties. These materials are compared to commercial resins Veriflex® and Veriflex-E® which are styrene- and epoxy-based proprietary formulations, respectively. The thermal and mechanical properties are determined utilizing thermogravimetric analysis and dynamic mechanical analysis. The temperatures at which 2% weight loss is observed in dry air ranges from 272 to 305 °C for the synthesized polymers, and occurs at 242 and 317 °C for the commercial Veriflex® and Veriflex-E® respectively. The glass transition temperatures, as measured by the peak in the tan(δ) curve, for the synthesized polymers range from 110 to 144 °C which is a higher than the Veriflex® and Veriflex-E® achieve at 84.3 and 100 °C respectively. With operation temperatures of subsonic structural aircraft components often reaching 121 °C (250 °F), the transition temperatures of the bismaleimide-based shape memory polymers are clearly desirable to ensure that shape memory polymers used in aircraft structures will not be prematurely triggered by the existing heat loads. In addition, the shape memory performance of the bismaleimide-based shape memory polymers compares well with the Veriflex® and Veriflex-E® resins.

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Hosur, Mahesh V., Orion Gebremedhin y Shaik Jeelani. "Processing and Performance Evaluation of Nanoclay Infused EPON828". En ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43830.

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The field of polymer-clay nanocomposites has attracted considerable attention as a method of enhancing polymer properties and extending their utility. In this research, different nanocomposites have been manufactured by modifying the EPON828 resin system through the infusion of 0.5%, 1%, 1.5% and 2% by weight of clay (Nanocor® 1.30E) nanoparticles. Mechanical properties such as flexural, compressive, tensile and high strain rate strengths and moduli of polymer matrix were improved in nano structured materials owing to their unique phase morphology and improved interfacial interactions. A dynamic Mechanical analysis was performed to monitor changes in the thermal properties of the nanocomposite. Nanoclay reinforced epoxy showed consistent improvement in all the mechanical as well as Thermomechanical properties. High strain rate compressive modulus showed a progressive improvement over the neat values for all the strain rates used. SEM micrographs of the fracture surfaces for both tensile and flexural samples showed regular and continuous patterns of cracks for the neat samples. The nanophased samples on the other hand showed multiple irregular cracks which increased in densities with nanoclay loading.

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Nobile, Maria Rossella, Annalisa Fierro, Salvatore Rosolia, Marialuigia Raimondo, Khalid Lafdi y Liberata Guadagno. "Viscoelastic properties of graphene-based epoxy resins". En THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937328.

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Zhang, H., R. J. Huang, L. F. Li, D. Evans, U. (Balu) Balachandran, Kathleen Amm, David Evans et al. "PROPERTIES OF SOME TOUGHENED, RADIATION STABLE EPOXY RESINS". En ADVANCES IN CRYOGENIC ENGINEERING MATERIALS: Transactions of the International Cryogenic Materials Conference - ICMC, Vol. 54. AIP, 2008. http://dx.doi.org/10.1063/1.2900342.

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Nakane, H. "Thermal properties of epoxy resins at cryogenic temperatures". En ADVANCES IN CRYOGENIC ENGINEERING: Proceedings of the International Cryogenic Materials Conference - ICMC. AIP, 2002. http://dx.doi.org/10.1063/1.1472545.

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Barra, Giuseppina, Luigi Vertuccio, Carlo Naddeo, Maurizio Arena, Massimo Viscardi y Liberata Guadagno. "Thermal degradation and fire properties of epoxy modified resins". En 9TH INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2018. http://dx.doi.org/10.1063/1.5046011.

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Mackersie, J. W. "The electrical properties of filled and unfilled commercial epoxy resins". En Eighth International Conference on Dielectric Materials, Measurements and Applications. IEE, 2000. http://dx.doi.org/10.1049/cp:20000469.

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Zong, Yangyang, Dayong Gui, Si Yu, Canqun Liu, Wei Chen y Zhongnan Qi. "Preparation and properties of silicone -cycloaliphatic epoxy resins for LED packaging". En 2016 17th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2016. http://dx.doi.org/10.1109/icept.2016.7583128.

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Informes sobre el tema "Epoxy resins – Thermomechanical properties"

Ting, Robert Y., Aver A. Shaulov y Wallace A. Smith. Piezoelectric Properties of 1-3 Composites of a Calcium-Modified Lead Titanate in Epoxy Resins. Fort Belvoir, VA: Defense Technical Information Center, enero de 1990. http://dx.doi.org/10.21236/ada235934.

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Gilbert, Richard D. y Raymond E. Fornes. Chemical Treatment of Epoxy Resins to: 1. Reduce Moisture Sensitivity and 2. Improve the Mechanical Properties. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 1989. http://dx.doi.org/10.21236/ada212360.

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