Abstract
The electrical birefringence in solutions of some fractions and samples of polyamidobenzimidazole in DMMA and polyamidohydrazide in DMSO are studied with the aid of rectangular and sinusoidal pulse fields. A study of the dispersion of the electrical birefringence in sinusoidal fields and the kinetics of the rise and fall of the electrical birefringence in rectangular pulse fields leads to the conclusion that the main mechanism responsible for the measured electrical birefringence for both polymers is the large scale motion of their polar molecules, produced by the orienting action of the field on the rigid permanent dipoles of the molecular chains. The relaxation times τ are determined from the dispersion of the electrical birefringence, and the lengths of the Kuhn segments are determined from the relation between τ and MM; these lengths are almost the same for polyamidobenzimidazole and polyamidohydrazide respectively: A = (25 ± 10) nm. A study of the value of the Kerr constant K and its dependence on the MM shows that the strongly polar and strongly conducting solvents used in this work play a significant part in the formation of the macromolecular dipoles.
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