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Nonequilibrium material effects on the behavior of polymeric composite matrices and their related composites

Author
Wilkes, G. L.
Published
Apr 2, 1982.
Physical Description
1 electronic document
Online Version

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Summary
The effects of physical aging on the material properties of some linear and network macromolecular glasses are discussed. The free volume concept is used to describe this behavior. The effect of physical aging on properties of some uniaxial graphite/fiber epoxy resin composites is investigated using stress relaxation in both tensile and flexural modes. The matrix polymers used were resins both of which are based on a 4,4-methylenedianiline derivative of epichlorohydrin with diamino diphenyl sulfone (DDS) as the curing agent. The matrix resin, as used in the practical application in composites, not fully cured and the glass transition of the network was dependent on the curing schedule. The physical aging of the bulk crosslinked epoxy was found to depend on the annealing temperature, and the T sub g of the resin. The physical aging of the composite, monitored by the stress relaxation method, was found to be dependent on the testing direction.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19820023657.
Accession ID: 82N31533.
NAS 1.26:169286.
NASA-CR-169286.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15715052