New epoxy resin systems for aerospace composites
- CSIRO, Clayton, Victoria (Australia). Division of Chemicals and Polymers
New epoxy resin system development over the past few years has largely been centered around minor structural variations on a few epoxy and hardener components in standard use. This paper will describe some of the chemical, physical and mechanical characteristics of completely new epoxy resin systems consisting of macrocyclic epoxy compounds and diaminobisimide hardeners. The epoxy resin components are polyglycidyl ethers of polyhydric macrocyclic phenols and are stable solids. They have moderate melting points and intermediate epoxy equivalent weights. When cured with the new hardeners in simple, low cost matrix formulations high T{sub g} value cured resin systems are obtained. The new diaminobismide compounds used as hardeners in these systems are made by novel technology which ensures that they are relatively pure monomeric compounds thus introducing a level of uniformity of product not previously seen in this type of compound. As they are of considerably higher molecular weight than hardeners in use at the present time, they give more scope for toughening composites made with these matrix materials. Despite the higher molecular weight, the new hardeners are more easily incorporated into practical formulations use at the present time. This paper will describe physical and chemical studies on the curing chemistry of these new systems reported will be some results of toughening studies of the base systems by admixture with reactive rubbers and/or thermoplastics. Composite laminates fabricated from carbon fiber cloth impregnated with the new systems have been shown to possess particularly low water absorption and high T{sub g} properties. Some of the other key mechanical properties of these composites will also be reported.
- OSTI ID:
- 143627
- Report Number(s):
- CONF-930246-; ISBN 0-87339-251-5; TRN: IM9413%%137
- Resource Relation:
- Conference: Advanced composites `93: international conference on advanced composite materials (ICACM), Wollongong (Australia), 15-19 Feb 1993; Other Information: PBD: 1993; Related Information: Is Part Of Advanced composites 1993; Chandra, T. [ed.] [Univ. of Wollongong (Australia)]; Dhingra, A.K. [ed.] [DuPont, Wilmington, DE (United States)]; PB: 1464 p.
- Country of Publication:
- United States
- Language:
- English
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