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The thermal oxidative stability of Fiberite 7714A (glass/epoxy), 976 (carbon/epoxy) arid 977-2 (carbon/epoxy) were studied at temperatures up to and above their respective glass transition temperatures. Composite samples were subjected to both long and short durations of heating. The first set of samples were heated for 4 to 6 hrs from 100 to 350°C and the second set of samples were cycled for 30 min intervals from 200 to 400°C.
The samples were tested in a Perkin-Elmer TGA7 Thermogravimetric Analyzer and the weight loss recorded. The weight loss data was compared on the basis of temperature and time at temperature. The results showed good thermal stability for each epoxy material through its glass transition temperature with a weight loss of 1.5% or less. The results were comparable for both long and short-term temperature exposure.
epoxy, composite, thermal analysis, thermal stability, glass fibers, carbon fibers
Chemist, Benet Labs, Watervliet Arsenal, Watervliet, N.Y.