Novel poly(ether benzimidazole)s from bis(nitrobenzimidazole) derivatives

Preparation and characterization of new soluble benzimidazole–imide copolymers

“…The present paper describes some recent investigations on the synthesis of poly(benzimidazole-imide)s copolymers that are performed to enhance the thermal properties of conventional polyimides. The route to these copolymers involved the synthesis of 2,2'-alkylene-or arylene-bis(5-nitrobenzimidazole)s, 27 which are then reduced into the corresponding bis(5-amino) compounds. The latter are condensed with aromatic tetracarboxylic anhydrides 28,29 to yield benzimidazole-imide copolymers.…”