Study of the formation conditions of aromatic polyimides and of benzoxazole-imide copolymers based on 3,3′-dihydroxy-4,4′-diaminodiphenylmethane

Abstract

Optimum conditions were found for the synthesis of aromatic polyimides based on 3,3′-dihydroxy-4,4′-diaminodiphenylmethane and pyromellitic or 3,3′4,4′-tetracarboxydiphenyloxide dianhydrides. Benzoxazole-imide copolymers based on polyhydroxyamide and polyamide acid were obtained. The effect of the method of preparation and of the initial ratio of components on the copolymer properties was studied. The processes occurring during thermal treatment of the obtained polymers were studied by IR spectroscopy.