Viscosity of weakly charged polyelectrolyte solutions: the mode-mode coupling approach

A model based on mode-mode coupling approximation (MMCA) to describe the reduced viscosity η r , of weakly charged polyelectrolyte solutions is proposed. The variation of η r , with the polyelectrolyte concentration C p exhibit a peak. The effects of charge parameter f, added salt concentration C s , and molecular weight M w are presented with and without hydrodynamic interactions, corresponding respectively to the Zimm and Rouse models. Both models dive the same features but are quantitatively different