Correlation between intrinsic viscosity and flow birefringence for the rigid chains of an aromatic polyamide in solution

Theories of flow birefringence and intrinsic viscosity, as developed for wormlike chains in the non-Gaussian range of the molecule length, have been analyzed. As a result, a new presentation is suggested for dynamo-optical data in a form, suitable for the determination of the conformational and optical parameters of the macromolecules: Kuhn's random link A, segment diameter d, and optical anisotropy beta per unit length of the chain. A model developed for wormlike cylinders with rounded caps was applied to the data obtained for the rigid-chain polybenzimidazolterephthalamide.