Abstract
Abstract Polyimides have been synthesized from pyromellitic dianhydride, 3,3′,4,4′-benzophenone tetracarboxylic dianhydride, and bis(p-aminophenyl) alkane diamines using a two-step method. All the polycondensation reactions were carried out in dimethyl acetamide under identical reaction conditions. The poly(amic acids) obtained in the first step had inherent viscosities of 0.39–0.93 and were thermally converted to polyimides. The thermal stabilities of these polyimides were measured by dynamic thermogravimetry in air. Properties of the methyl-substituted polyimides are compared with those of unsubstituted ones. The introduction of a methyl group into the polymeric chain led to a decrease in the inherent viscosity and the thermal stability.
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