Der einfluß von faseroberflächen auf die matrixhärtung bei faserverbundwerkstoffen

Peter, K. V.; Gerhard‐Abozari, Eva; Höcker, Hartwig

doi:10.1002/apmc.1995.052280111

Cited by 2 publications

(1 citation statement)

References 7 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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The effect of kevlar fiber reinforcement on the curing, thermal, and dynamic‐mechanical properties of an epoxy/anhydride system

Suay

Pradas

Ribelles

2000

Polymer Engineering & Sci

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Curing, thermal, and dynamic‐mechanical relaxational behavior of an epoxy/‐anhydride resin and a Kevlar‐fiber/epoxy composite were compared. Reinforcement by Kevlar fibers had a catalytic effect on the curing reaction. Reinforced formulations produced higher extents of reaction than neat formulations at the same curing time. Curing kinetics was also studied by means of DSC heating scans. When the Kevlar content increased, the heat flow curves and the exothermic peak temperature shifted significantly to lower temperatures. The glass transition temperature of the matrix also decreased as the Kevlar content increased. Postcuring reduced the differences between the neat and reinforced formulations. Loss tangent and storage modulus versus frequency master curves were obtained from isothermal dynamic‐mechanical measurements. The effect of fiber addition on the main dynamic‐mechanical relaxation was analyzed with a simple mechanical model.

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Der einfluß von faseroberflächen auf die matrixhärtung bei faserverbundwerkstoffen

Cited by 2 publications

References 7 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

The effect of kevlar fiber reinforcement on the curing, thermal, and dynamic‐mechanical properties of an epoxy/anhydride system

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