POLYBENZOXAZINONES AND POLY(BENZOXAZINONE-PHENYLQUINOXALINE)S CONTAINING PENDANT IMIDE GROUPS

Polybenzoxazinones and poly(benzoxazinone-phenylquinoxaline)s containi ng pendant imide groups have been synthesized by cyclopolycondensation of diacid chlorides which contain preformed imide rings, with 3,3'-di carboxy-4,4'-diaminodiphenyl-methane or with mixtures of the latter wi th a bis(amino-phenylquinoxaline). The low temperature solution polyco ndensation technique afforded poly(amic-acid)s in the first step, whic h underwent thermal or chemical cyclodehydration, in the second step. The cyclodehydration process of the poly(amic-acid)s has been studied by infrared, thermogravimetric and differential scanning calorimetry a nalyses. The solubility, thermal stability and glass transition temper ature of these polymers have been studied and compared with related he terocyclic polymers that have been previously reported. Copyright (C) 1996 Elsevier Science Ltd