Abstract
Anhydride terminated polyamic acid prepolymer was prepared from pyromellitic dianhydride and a diamine ( para-phenylene diamine/benzidine) in dimethyl formamide. The prepolymer was reacted with the other diamine to obtain (A nB) m block copolymic acid. The polyamic acid was converted to the polyimide by thermal cyclodehydration. The properties of block copolyimides were compared with those of random copolyimides prepared by conventional routes.
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