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Vladimir N. Matveenko, Evgeny A. Kirsanov
Normal
stresses in the rheology of structured systems
Abstract
A structural-kinetic
model is considered, which allows one to obtain two rheological equations for describing
the dependence of the first difference of normal stresses on the shear rate in
the region of low rates and in the region of high shear rates. The obtained
equations are approximated to the experimental data for various structured
systems, namely, melts and polymer solutions. The regularities of the change in
the coefficients of the rheological equations with a change in the
concentration of the polymer in the solution and with a change in the molecular
weight of the polymer are explained within the framework of the
structural-kinetic concepts.
Key words:
structural rheological model, polymer melts, viscoelastic properties
Copyright (C) Chemistry Dept., Moscow State University, 2002
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