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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2016, 16 (3), 69—77. DOI: 10.18083/LCAppl.2016.3.69
Non-Newtonian Flow of Structured Systems. XVIII. Normal Stress
E. A. Kirsanov, Yu. N. Timoshin
Author affiliations Moscow Region State Institute of Humanities and Social Studies, Zelyonaya St., 30, Kolomna, 140411, Moscow Region, Russia E-mail: Kirsanov47@mail.ru
Abstract Viscoelastic effects at the steady-state flow of polymer melts and polymer solutions are considered. In the framework of the structural model the viscous behavior is explained by energy dissipation while macromolecules associates' moving. Decrease of viscosity is explained by reducing the number of macromolecules entanglements with shear rate increasing. It is shown that at high shear rates the first normal stress difference is described by the equation . In the region of low shear rates experimental data can be approximated by the linear dependence . The existence of quadratic dependence is possible only at very low shear rates.
Keywords: polymers, first normal stress difference, structural rheological model