Abstract:
An epoxy resin made by the reaction of the diglycidyl ether of
bis-phenol A and diaminodiphenyl methane was thermally degraded in vacuo
at temperatures between 200°C and 350°C. The effect of degradation was
examined by means of measurement of changes in the dielectric properties of
the material and also by examination of compounds evolved by the cured resin.
Definite evidence for the evolution of N-methyl aniline and N:N-dimethylaniline
is advanced and added evidence for a dehydration reaction is put forward.
Possible degradation mechanisms are discussed.
