Abstract
The effect of the nature of a solvent on the viscosity of a polymer solution is a most important problem but one on which opinions are divided. The general view is that the intrinsic viscosity of a polymer is lower in a poor solvent than in a good solvent, but we have shown that the initial Newtonian viscosity of concentrated polymer solutions of polystyrene (PS), cellulose acetate (CA), and polymethylmethacrylate (PMMA) is much greater in a poor solvent than in a good one (1). As will be seen from fig. 1, the absolute viscosity of solutions in various solvents may differ by a factor of 102–104. The minimal viscosities of concentrated solutions of cellulose esters in good solvents is a fact well known to technologists.
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