Filament of polyimide from pyromellitic acid dianhydride and 3,4'-oxydianiline

摘要

Polypyromellitimide filaments having high strength and high modulus are obtained by dry-spinning a solution of polyamide-acid of polypyromellitic dianhydride, 3,4'-oxydianiline and paraphenylenediamine, substituted derivatives thereof or 4,4'-diaminobiphenyl or 4,4'-diaminobenzanilide, then converting the polyamide-acid to the polyimide and drawing.