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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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Rus Eng

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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2018, 18 (4), 57—65.
DOI: 10.18083/LCAppl.2018.4.57





Non-Newtonian Flow of Structured Systems. XXVI. Viscoelasticity of Polystyrene Melt



E. A. Kirsanov, Yu. N. Timoshin

Author affiliations
tate University of Humanities and Social Studies,
30 Zelyonaya St., Kolomna, 140411, Moscow Region, Russia
E-mail: Kirsanov47@mail.ru

Abstract
The structural rheological model has been used to interpret the results of dynamical measurements of different melts of polystyrene, namely the polydisperse polystyrene with broad molecular weight distribution, the monodisperse polystyrene with narrow molecular weight distribution and the mixture of two samples of polystyrene with different molecular masses. We have distinguished different intervals of the cyclic frequency, which correspond to different states of polymer melt. In the low-frequency region, the structure of polymer melts remains practically unchanged, while in the high-frequency region the structure is destructed. There are transitional regions between different regimes of shear oscillations. Separate regimes of shear oscillations are described by rheological equations of the structural rheological model.

Keywords: polystyrene melts, viscoelastic properties, structural rheological model.





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