Abstract
The potential surface for the motion of cyclic groups in polyimide based on pyromellitic acid and p-phenylenediamine is calculated in the atom-atom approximation, making allowance for local density fluctuations. The values of the internal rotation barriers for phenylene and pyromellitimide rings are found. In regular crystalline polyimides, apart from torsional vibrational mobility of the pyromellitimide rings, rotational motion of the phenylene rings is also possible. The heights of the energy barriers for rotation of the rings are determined by the energy consumed when fluctuations occur, and by inter- and intralayer interactions.
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