Compositions of aromatic polybenzimidazoles and aromatic polyimides or aromatic polyetherimides.

摘要

Novel miscible compositions comprising from about 1 part by weight to about 99 parts by weight of an aromatic polyimide or polyetherimide and from about 99 parts by weight to about 1 part by weight of an aromatic polybenzimidazole. In a composition mostly comprised of an aromatic polybenzimidazole, it is preferred that the aromatic polyimide be thermoplastic and that it or the aromatic polyetherimide be present in the composition in an amount sufficient to make the aromatic polybenzimidazole more processable for molding purposes and also less susceptible to moisture. In a composition mostly comprised of a soluble, thermoplastic aromatic polyimide or aromatic polyetherimide it is preferred that the aromatic polybenzimidazole be present in an amount sufficient to render the soluble thermoplastic aromatic polyimide or aromatic polyetherimide less sensitive to solvents, and to increase the glass transition temperature of the aromatic polyimide or polyetherimide. Phase-separated compositions may be formed from the miscible compositions by heating a composition above its binodal or spinodal phase boundary temperature or glass transition temperature to cause it to phase separate and then quickly quench-cooling it to freeze the phase-separated morphology. The novel compositions are useful under severe environmental conditions. The compositions have good impact resistance, enhanced solvent resistance and generally good price-performance characteristics.