COPOLYMER OF POLYIMIDE OLIGOMERS AND TEREPHTHALONITRILE N,N-DIOXIDE AND THEIR METHODS OF PREPARATION

摘要

We have disclosed a new class of thermosetting copolymers derived from terephthalonitrile N, N'-dioxide and polyimide oligomer that cure through addition reactions to form essentially void-free cured resins that exhibit outstanding high temperature stability. These copolymers may be formed from either acetylene terminated polyimide oligomers or nitrile terminated polyimide oligomers. Copolymers prepared in accordance with our invention exhibit little or no outgassing during cure and are extremely useful in the preparation of laminates where high temperature stability and high strength is required.