Some remarks on excluded volume and on intrinsic viscosity plots

Abstract

A simple (2,2) Pad; approximant based on the first three terms in the asymptotic cluster series for the expansion factor a 2 ( z ) is shown to give fairly good values over the entire positive range of the interaction parameter z. In a separate discussion it is shown by a specific example that extrapolations of viscosity data in good solvents and based on excluded-volume relations for flexible chains must be used only with great caution.