The unperturbed root‐mean‐square radius of gyration of a polystyrene sample was measured in ten critical consolute mixtures encompassing solubility parameters ranging from 8.1 to 11.4 (cal./cm. 3 ) 1/2 . The values of the intrinsic viscosity and coil size were found to reach a maximum in the vicinity of δ p , the polymer solubility parameter. Preferential adsorption of the solvent component in the mixture, by polystyrene, was observed in each of the ternary systems examined. The variations in coil size and intrinsic viscosity were found to be mainly a function of solvent polarity and were not caused primarily by preferential adsorption, which was comparatively small in most of the mixtures.
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J. M. G. Cowie (1968) studied this question.