VCL#55 Dual-Phase Interpretation of Shear-Thinning -part 1

Abstract

The decrease of viscosity with shear rate or frequency (in a dynamic experiment) is called "shear-thinning". It's analytical formulation is well known and its practice quite common, in injection molding for instance. The Dual-Phase interpretation of shear-thinning is spectacularly different from previous explanations, as already presented in VCL#54. In fact, it is suggested that the classical molecular dynamic explanations of shear-thinning are contradicted by simple Rheo-SANS experiments which rule out an increase of the rms end to end distance of the macromolecule radius of gyration as shear-thinning proceeds. In this lecture the mechanism of stretch/relax ("blinking") that we associate with shear-thinning is correlated with the sweeping frequency of the elastic dissipative wave characteristic of the Newtonian behavior.

Links to download VCL#55 (129 MB; 2h 10 min): inquire at newschoolpolymerphysics@gmail.com

Att: Dr. A. Beltzeki