The Newtonian Viscosity of Polymer Solutions: Over a Wide Range of Concentrations

Abstract

Viscos i ty of three pol ymers, namely polyi sobutyl ene, cel lulose acetate and polyschizophyl Ian, having different degree of flexibility is investigated over a wide range of concentrations and weights. The data so obtained show a smooth variation in viscosity with respect to concentration of the polymers. The relationship between mlecular weight of polymers and intrinsic viscosity or characteristic concentration, c is ch obtained, by fitting the data to method of least squares. values of ch the polymers were calculated using Graessley and Simha et al . models. or cLn] were plotted to get the superposition curves for every ch pol ymer. Where n is the reduced viscosity of the polymers. The data show that the deviations from these curves increase with the increase in rigidity of the polymer and it was not possible to scale the polyschizophyl Ian data using either of the above mentioned mdels. The data further show that the Graessley model is better than the others