Abstract
A theory for the viscosity η of semi-dilute solutions of a linear flexible polymer was formulated on the postulate that η in this concentration regime is governed by the effective hydrodynamic volume per polymer segment and chain entanglement. The former was treated from a molecular point of view and the latter formulated phenomenologically. All the parameters in the theory can be estimated from dilute solution data and the asymptotic behavior of η for large molecular weight. It was found that the theory describes almost quantitatively the experimental data obtained by Adam and Delsanti and also by us for polystyrene in cyclohexane and in benzene.
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