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Epoxy matrices for filament‐wound carbon fiber composites
Author(s) -
Morgan Roger J.,
Walkup Connie M.
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070340103
Subject(s) - epoxy , composite material , materials science , protein filament , fiber , filament winding
Epoxies suitable for filament‐winding fibrous composites must be processible at ambient temperatures, nontoxic, chemically simple, undergo full cure at ≤ 100°C and, also, be tough and exhibit a T g > 120°C. In this paper, we report the cure characteristics, processibility, toxicity, and mechnical and physical properties of a number of amine‐cured diglycidyl ether of bisphenol‐A (DGEBA) epoxide candidate systems suitable for filament‐wound carbon fiber composites. 2,5‐Dimethyl‐2,5‐hexane diamine (DMHDA)‐cured DGEBA epoxy was found to be the most promising candidate. The good processibility and thermal properties, together with the low cure characteristics of the DGEBA–DMHDA epoxy system, are discussed in terms of molecular structure of the amine molecule. The network structural parameters that control epoxy toughness and subsequent embrittlement upon plastic flow are discussed. Evidence is presented for plastic flow‐induced thermal and mechanical property deterioration of epoxies as a result of network chain scission.