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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., 2016, 16 (4), 69—79.
DOI: 10.18083/LCAppl.2016.4.69

Non-Newtonian Flow of Structured Systems. XX. The Viscosity of Polymer Solutions

E. A. Kirsanov, Yu. N. Timoshin

Author affiliations
State University of Humanities and Social Studies,
30 Zelyonaya St., Kolomna, 140411, Moscow Region, Russia

Curves of viscosity and curves of polymer solutions’ flow (xanthan, nitrocellulose, λ-carrageenan, sodium carboxymethylcellulose, polyacrylamide) are considered. The article show that for some polymer solutions generalized flow equation is valid in a wide interval of shear rates (up to seven orders of magnitude), at very low shear rates (up to 10–4 s–1). It is shown that two regimes of flow can to be coexisted on a wide range of shear rate. It was found that the coefficient of aggregation τc1/2 is almost independent of the temperature, the coefficient of viscosity of Casson ηc1/2 is reduced, and coefficient of compactness χ increases with increasing of temperature. These results are consistent with the conclusions of the structural rheological model.

Keywords: polymer solutions, structural rheological model, flow regimes, the coefficients of generalized flow equation

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