Abstract

A study was made of present-day trends in the development of polycondensation methods for the synthesis of thermostable heterocyclic polymers, in particular polybenzazoles and PIs. Subjects of major interest were catalytic methods that could be used for the synthesis of polybenzazoles and variants of these polymers by precipitative, and reduction methods, as well as by “direct” polyheterocyclization. The study also covered complex reactions in the synthesis of polybenzazoles leading to “ladder” polyheterorylenes of the polyazoloquinazoline series. A promising trend in the development of PI chemistry has resulted in polynaphthylimides and their derivatives, viz. polynaphthoylenebenzimidazoles. The latter are considered to be the most promising representatives of the next generation of polyheteroarylenes.

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