Abstract
The optical anisotropy of molecules of pyromellite-dianilic amido acid polyesters has been studied by the method of flow birefringence. Positive flow birefringence, which depends on the isomeric composition of the repeating unit, is detected. The thermodynamic rigidity of pyromellite-dianilic amido acid polyester molecules is calculated in terms of the valence-optical scheme. On passage from 100% para isomers of pyromellite-dianilic amido acid polyesters to macromolecules with a predominant content of meta isomers, optical anisotropy and equilibrium rigidity decrease by a factor of ∼2.
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