Effects of structure on properties of some new aromatic‐aliphatic polybenzimidazoles

Abstract

Abstract Polybenzimidazoles were prepared in poly(phosphoric acid) from isophthalic, m ‐ and p ‐phenylene diacetic, succinic, adipic, suberic, and sebacic acids and 3,3′‐diaminobenzidine, 3,3′,4,4′‐tetraaminodiphenyl ether and 3,3′,4,4′‐tetraaminodiphenylmethane. The thermal, mechanical, and bonding properties were studied. A 3:1 copolymer of isophthalic and m ‐phenylenediacetic acid with 3,3′‐diaminobenzidine showed the best results as far as isothermal oxidation resistance and thermal and processing characteristics.