Preferential Adsorption by Polymers Dissolved in Solvent Mixture

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Abstract
A straightforward method was proposed to measure the magnitude of preferential adsorption by polymers dissolved in solvent mixtures, and was experimentally checked for toluene—isobutanol—polystyrene and benzene—cyclohexane—polystyrene systems. This method can be applied even to concentrated solutions in contrast to the light‐scattering method, and is more accurate than the latter. Preferential adsorption of toluene or benzene by polystyrene was clearly observed, and excess toluene around polymer molecules was found to be independent of concentration and molecular weight of the solute, and also of solvent composition.