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Vladimir N. Matveenko, Eugine A. Kirsanov
Dependence of dynamic viscosity and dynamic elasticity on thestrain amplitude
in a polymer solution
Abstract
Abstract. The structural rheological model is used to
interpret the results of dynamic measurements in polymer solutions of polyacrylamide
and xanthan. The model describes the dependence of dynamic viscosity and
dynamic elasticity on thestrain
amplitude at a fixed frequency of shear oscillations. The structural
rheological model makes it possible to interpret the experimental curves as a
result of a change in the structure of a sample of a polymer solution under the
action of an oscillating shear flow. An integral characteristic of the
structure is the number of macromolecules linked by engagements into some
associates of macromolecules. The analysis of
rheological curves does not use the concept of a continuous or discrete
relaxation spectrum.The
experimental data are approximated by the equations of the structural model in
separate intervals of thestrain amplitude, which correspond to different states of the
structure of the polymer solution.
Key words:
polymer solution, dynamic viscosity, dynamic elasticity, dependence on the strain amplitude, structural rheological model
Copyright (C) Chemistry Dept., Moscow State University, 2002
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