Abstract
Four versions of the internal viscosity model are summarized and examined with respect to their ability to fit experimental stress data. Emphasis is placed on model C II, one of three proposed by Cerf and the most widely known. Model predictions are compared simultaneously with data on non-Newtonian viscosity, normal stress coefficient, and complex viscosity components for each of several solutions of monodisperse polystyrene in Aroclor. It is concluded that all four models suffer from defects that may limit their applicability for engineering purposes, but that some may have further utility for describing ideally dilute solution behavior.
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