Osmotic Pressure Measurements for Poly-p-Chlorostyrene Solutions

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Abstract
Osmotic pressure measurements were made on poly-p-chlorostyrene fractions in toluene. Their intrinsic viscosities were measured in toluene, butanone, and chlorobenzene at 30°C. The intrinsic viscosity - molecular weight relationships of these systems were then evaluated for the monodisperse homologue by applying the proper correction for the heterogeneity in the sample. The unperturbed dimension of the polymer was estimated by the Kurata-Stockmayer method. A comparison of this estimate with that for polystyrene indicated that the chlorine atom at the para-position had no appreciable effect on the hindrance to the internal rotation of chain. The heat of the dilution of the polymer in toluene and chlorobenzene was also determined from measurements of the temperature coefficient of the osmotic pressure. It was endothermic in toluene and approximately zero in chlorobenzene. These results were then discussed in relation to the cohesive energy densities of the polymer and the solvents.

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