Abstract
Isotropic poly-(4,4′-oxydiphenylene)pyromellitamic acid films were kept in mixtures of benzene, acetic anhydride and pyridine, which led to transformation of polyamic acid into cyclochain heterogeneous polymers containing imide and iso-imide units. After being removed from the imidizing mixture the films underwent heat treatment resulting in formation of the final chemical structure of poly-(4,4′-oxydiphenylene)pyromellitimide. A study was made of changes in the strength and the breaking elongations of films during treatment with the imidizing mixture and subsequent heating. An increase in the number of imide units in the cyclochain polymers was accompanied by an improvement in mechanical properties of the polyimides obtained after heat treatment.
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