The osmotic pressure, light scattering, and vapor pressure of linear polymer solutions in the moderately concentrated region were studied for poly(a-methylstyrenes) having sharp molecular weight distributions and covering a wide range of molecular weight. The reduced osmotic pressure icMf CRT, where M is the molecular weight and C is the polymer concentration, was found to be a universal function of the degree of coil overlapping, which is defined by the ratio of polymer concentration C to a critical concentration C*. In moderately concentrated solution, where C is larger than C*, /CRT is proportional to (C/C*)1•32®, in good agreement with the scaling theory of des Cloizeaux.
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