MODIFIED COX-MERZ RULE FOR CHARGED POLYMER SYSTEMS IN SOLUTION

A simple technique is developed for predicting the dynamic viscosity f rom the steady shear viscosity data of polyelectrolyte solutions. The Carreau-type viscosity equation is used to represent both the steady s hear and dynamic viscosity data. A shift factor beta, defined as the r atio of the dynamic time constant to the steady shear time constant, i s introduced. This dimensionless parameter enables all the dynamic vis cosity data to be shifted onto the steady shear viscosity curve. The p arameter beta correlates well with the zero shear viscosity and has th e following form: beta-1/2.5 = [1 + (3eta0)2]-0.3.