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Liquid Crystals and their Application
Russian Journal Zhidkie kristally i ikh prakticheskoe ispol'zovanie Жидкие кристаллы и их практическое использование |
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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2010, 4, 77—82. |
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Temperature Dependence of Short Range Orientational Order in Polystyrene Melt
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S. G. Polushin, V. B. Rogozin, A. V. Zakhryapa, E. I. Rjumtsev
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Author affiliations
Physical Department of Saint-Petersburg State University,
Ulianovskaia st., 1. Petrodvoretc, 198504 Saint-Petersburg, Russia
E-mail: polushin@paloma.spbu.ru
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Abstract
The equilibrium electric birefringence of two fractions of polystyrene: an oligomer with a molecular mass of 504 and a polymer with a molecular mass of 9100 was investigated in melt. Temperature dependences of the Kerr constant K(T) were established at the temperature range of 200 oC. It is found that the value of K remains unchanged in oligomer, whereas in a polymer sample Kerr constant K increases strongly with temperature. This may be due to the mutual ordering of the benzene rings, which occurs when the compactization of polymer coils takes place with T increasing.
Keywords: short-range order, isotropic phase, Kerr effect, polystyrene
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