Heterocyclic Polymers Derived from 1,2,4,5-Naphythalene tetracarboxylic Acid Dianhydride.

摘要

Polycondensation of 3,3'-diaminobenzidine and 1,2,4,5-naphthalenetetracarboxylic acid dianhydride in aprotic solvents at 80C to 120C gave soluble low molecular weight polymers. Increasing the reaction temperature to 160led to further condensation and gave increasing amounts of insoluble cross-linked material. Some higher molecular weight solid polymer was obtained when m-cresol was used as solvent. The low molecular weight polymers could be further condensed and chain extended with about a twofold increase in molecular weight by heating at 250 C/0.1mm. However,linear polymers which had been prepared in aprotic solvents up to 80C,on 'second staging'gave 33% to 39% of insoluble cross-linked material. This is believed to be due to a branching reaction taking place between 80C and 120C at the ortho anhydride linkage. (Author)