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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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We are pleased to inform that the journal Liquid Crystals and their Application is included in Web of Science (Emerging Sources Citation Index) and Scopus databases.

Journal



Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2014, 14 (2), 65—73.





Non-Newtonian Flow of Structured Systems. IX. The Elasticity of Polymer Solutions



E. A. Kirsanov, Yu. N. Timoshin

Author affiliations
Moscow State Region Socio-Humanitarian Institute
Zelenaya st., 30, 140410 Kolomna, Moscow Region, Russia. 
E-mail: Kirsanov47@mail.ru

Abstract
The structural rheological model to describe the elastic properties of polymer solutions under steady state flow is proposed. The new equation is used for the first normal stress differenceN1. This equation of elasticity similar to generalized flow equation and describes experimental dependence at high shear rates. The first term is a structural part of the elasticity due to associates of macromolecules. The second part describes the own elasticity of individual macromolecules. Structural rheological model predicts a linear dependence N1 of the shear rate at low shear rates. Experimental results demonstrate the dependence , and the magnitude ΔN1 can have both positive and negative. Appearance in this equation values ΔN1 may be due to a systematic error in the measurement of the elastic forces. Popular rheological models predict different behavior of N1, namely, the quadratic dependence.

Keywords: viscoelastic systems, polymer solutions, structural rheological model, first normal stress difference, equation of elasticity





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