VCL#56 Shear-Thinning part 2: Network Entropy

Abstract

While shear-thinning can occur without a modification of the network of entanglements, certain conditions of deformation trigger the orientation of the network channel (network entropy) which, in turn, modify the shear-thinning mechanism. This is the case by deforming the melt in shear at higher frequencies, lower temperatures or larger strains in the so-called "rubbery plateau region". The existence of the rubbery plateau and its dependence on molecular weight is explained from a different understanding of what causes entropic effects: network entropy for the Cross-Dual-Phase model vs macromolecular chain entropy for the classical models.

Links to download VCL#56 (147 MB; 2h 47 min): inquire at newschoolpolymerphysics@gmail.com

Att: Dr. A. Beltzeki