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Vladimir N. Matveenko, Evgeny A. Kirsanov
Shear
hardening in the rheology of structured systems
Abstract
Abstract. A structural
rheological model is presented that describes the phenomenon of shear
solidification in structured systems, namely, in concentrated suspensions,
micellar solutions, solutions of associated polymers. The reason for shear
hardening is the appearance of a structure under the action of shear as a
result of an increase in the cohesion force between particles or
macromolecules. The integral characteristic of the structure is the total
number of particles in the aggregates. The kinetic equation describing the
process of formation-destruction of aggregates contains four rate constants and
leads to a rheological equation with two coefficients.
Key words: Structural-rheological model, shear
thinning and solidification, suspensions, surfactants, cylindrical micelles
Copyright (C) Chemistry Dept., Moscow State University, 2002
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