Thermal and mechanical characterization of amine-epoxy/Kevlar fibre composites

Suay, J.; Pradas, Manuel Monleón; Ribelles, J.L. Gómez

doi:10.1002/(sici)1097-0126(199912)48:12<1269::aid-pi304>3.0.co;2-l

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…Kinetics modeling of prepregs curing is not easy to evaluate owing to the many concomitant reactions occurring contemporary and/or in sequence on several comonomers and initiators, to the possible presence of additive or accelerants and to the intrinsic difficulty of monitoring such a complex system that ends up in an insoluble network . Moreover, in prepregs the situation is made even more complex by the influence that different fibers might have, depending on surface chemistry and sizing treatments . When studying curing kinetics of epoxy resins by DSC, both isothermal and dynamic methods can be adopted.…”

Section: Resultsmentioning

confidence: 99%

Kinetics and modeling of curing behavior for two different prepregs based on the same epoxy precursor: A case study for the industrial design of thick composites

et al. 2013

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The industrial production of a thick part obtained by hand lay‐up of two commercial prepregs (≈35 mm) and intended for primary structural application is considered. Prepregs are made of either unidirectionally aligned fibers, PP‐UD, or 2 × 2 twill woven fabric, PP‐T2. While the resin is exactly the same, the prepreg production technology is different, namely, hot melt and solvent impregnation, respectively. The study shows that the prepregs age differently in the time span required for the process work up. Moreover, simulation of the independent curing process of each raw material shows unexpected differences both in the timescale (PP‐UD reacts faster than PP‐T2) and in the extent of reaction (PP‐UD develops a higher amount of heat than PP‐T2). The outlined differences require a particular care in the design of the curing cycle for production of thick composites where sequences of different prepregs alternate with no necessarily regular pattern, in order to reduce overheating, and to promote equal reaction of the two components without inducing too much residual stress between adjacent layers. This work shows that the experimental verification of raw materials and curing conditions might help identifying unforeseen industrial critical situations and avoiding the lack of performance in the final composite materials. POLYM. COMPOS., 34:1506–1514, 2013. © 2013 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Kinetics and modeling of curing behavior for two different prepregs based on the same epoxy precursor: A case study for the industrial design of thick composites

et al. 2013

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Cure kinetics of epoxy resin used for advanced composites

Guo

Zhang

et al. 2004

Polymer International

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The cure kinetics of an epoxy resin used for the preparation of advanced polymeric composite structures was studied by isothermal differential scanning calorimetry (DSC). A series of isothermal DSC runs provided information about the kinetics of cure over a wide temperature range. According to the heat evolution behavior during the curing process, several influencing factors of isothermal curing reactions were evaluated. The results showed that the isothermal kinetic reaction of this epoxy resin followed an autocatalytic kinetic mechanism. In the latter reaction stage, the curing reaction became controlled mainly by diffusion. Cure rate was then modeled using a modified Kamal autocatalytic model that accounts for the shift from a chemically controlled reaction to a diffusion‐controlled reaction. The model parameters were determined by a nonlinear multiple regression method. Copyright © 2004 Society of Chemical Industry

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Effect of plasticizer on the thermal, mechanical, and anticorrosion properties of an epoxy primer

Rodriguez

García

Cabello

et al. 2005

J Coat. Technol. Res.

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The influence of the glass transition temperature and the mechanical and anticorrosion properties of factors such as the amount of plasticizer added to an epoxy primer were investigated by DSC (differential scanning calorimeter), DMA (dynamic mechanical analysis), stress-strain tests, salt fog spray tests, accelerated tests, and electrochemical tests.The addition of plasticizer results in a decrease in the glass transition temperature and a change in the mechanical properties. Different tests were carried out to the optimum percentage of plasticizer content (1.5-3% weight ratio to epoxy resin) required to obtain the maximum anticorrosion performance of the epoxy primer. These changes are explained by the structural-kinetic effect exerted by the plasticizer on the chemical crosslinking in the course of the epoxy network synthesis and the increase in the excess free volume.

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Thermal and mechanical characterization of amine-epoxy/Kevlar fibre composites

Cited by 5 publications

References 18 publications

Kinetics and modeling of curing behavior for two different prepregs based on the same epoxy precursor: A case study for the industrial design of thick composites

Kinetics and modeling of curing behavior for two different prepregs based on the same epoxy precursor: A case study for the industrial design of thick composites

Cure kinetics of epoxy resin used for advanced composites

Effect of plasticizer on the thermal, mechanical, and anticorrosion properties of an epoxy primer

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