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Impact properties of rubber-modified epoxy resin-graphite-fiber compositesTo improve the impact resistance of graphite-fiber composites, a commercial and an experimental epoxy resin were modified with liquid reactive rubber and a brominated epoxy resin. The commercial epoxy was a tetrafunctional resin, and the experimental epoxy was a trifunctional resin. The reactive rubber was a carboxyl-terminated butadiene-acrylonitrile copolymer. The rubber content was varied from 0 to 25 percent (wt). The brominated epoxy resin was used at Br levels of 4, 19, and 35 percent of the resin. Composites were prepared with woven graphite cloth reinforcement. The composites were evaluated by using flexural strength in the dry state and an elevated temperature after saturation with water. The impact properties were determined by measuring shear strength after falling-ball impact and instrumented impact. The rubber-modified, trifunctional resin exhibited better properties, when tested in hot-wet conditions in a heated oven at 366 K (after boiling the material for 2 h in demineralized water), than the tetrafunctional resin. Improved impact resistance was observed with the addition of the reactive rubber to the epoxy resin. Further improvement was observed with the addition of the brominated epoxy resin.
Document ID
19850045866
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Gilwee, W. J.
(NASA Ames Research Center Chemical Research Projects Office, Moffett Field, CA, United States)
Nir, Z.
(NASA Ames Research Center Chemical Research Projects Office, Moffett Field, CA; Makhteshim Chemical Works, Beersheba, Israel)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Composite Materials
Accession Number
85A28017
Distribution Limits
Public
Copyright
Other

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