[5,5′-Biisobenzofuran]-1,1′,3,3′-tetrone, polymer with 1,3-benzenediamine and 1,4-benzenediamine 1,3-Benzenediamine, polymer with 1,4-benzenediamine and [5,5′-biisobenzofuran]-1,1′,3,3′-tetrone 1,4-Benzenediamine, polymer with 1,3-benzenediamine and [5,5′-biisobenzofuran]-1,1′,3,3′-tetrone 1,4-Diaminobenzene-1,3-diaminobenzene-3,3′,4,4′-biphenyltetracarboxylic dianhydride copolymer 3,3′-4,4′-Biphenylenetetracarboxylic dianhydride-m-phenylene diamine-p-phenylene diamine copolymer 3,3′,4,4′-Biphenyltetracarboxylic anhydride-m-phenylenediamine-p-phenylenediamine copolymer 3,3′,4,4′-Biphenyltetracarboxylic dianhydride-m-phenylenediamine-p-phenylenediamine copolymer Biphenyl-3,3′,4,4′-tetracarboxylic acid dianhydride-m-phenylenediamine-p-phenylenediamine copolymer