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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), 80—90.
DOI: 10.18083/LCAppl.2016.4.80

Non-Newtonian Flow of Structured Systems. XXI. Rheology of Polyisobutylene Solutions

E. A. Kirsanov, Yu. N. Timoshin

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

The rheological data of the solution of polyisobutylene in decahydronaphthalene are considered in terms of structural rheological model. Under conditions of steady flow the flow curves are described by the generalized flow equation. At low shear rates the region of Newtonian flow is observed. The flow disruption occurs at high shear rates. Under conditions of dynamic measurements similar plots are observed on the curve of dynamic viscosity. It is the evidence that viscosity at shear steady flow and viscosity at shear vibrations have the similar character. Curves of the storage modulus, in general, contain three plots. At high frequencies the curve is described by the equation of elasticity, similar to the generalized flow equation. At lower frequencies there is a linear dependence in the root coordinates. In some cases, at very low frequencies power dependence of the storage modulus are observed.

Keywords: polymer solutions, structural rheological model, steady flow, storage modulus, loss modulus

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