NON-NEWTONIAN FLOW OF STRUCTURED SYSTEMS. XXXIV. DEPENDENCE OF DYNAMIC VISCOSITY AND DYNAMIC ELASTICITY ON STRAIN AMPLITUDE IN AQUEOUS LATEX SUSPENSION

摘要

The structural rheological model is extended to describe the dependence of dynamic moduli on strain amplitude at the fixed frequency of shear oscillations. Kinetic equations that describe the process of simultaneous formation and destruction of particle aggregates under the action of shear are presented. The obtained rheological equations establish linkage between the nature in dynamic moduli change and the change in suspension structure. The equations were used to approximate the rheological curves obtained for the aqueous latex suspension. In the range of high strain amplitudes, the process of destruction of aggregates prevails. In the range of small strain amplitudes, the formation of contacts between particles leads to a gradual increase in the loss modulus as the amplitude increases.