A theory of the thermodynamic behavior of nonelectrolyte solutions. VII. Partial miscibility in the system polystyrene–cyclohexane

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Abstract
Maron's theory of the thermodynamics of nonelectrolyte solutions has been used to obtain from published osmotic pressure, light‐scattering, and partial miscibility data for the system polystyrene‐cyclohexane (μ° – σ°) and σ° values as functions of molecular weight and temperature. These functions were combined then with intrinsic viscosities to calculate the partial miscibility curves for five samples of polystyrene of varying molecular weight. Except for minor discrepancies, which are shown to be due to molecular weight heterogeneity, the calculated plots are in good agreement with the experimental results. The data have also been used to evaluate the interaction parameters at the points of critical miscibility. These calculations confirm the predictions of Maron and Nakajima that for infinite molecular weight these parameters go to the limits μc° = 2/3, σc° = 1/6, (μc° – σc°) = 1/2, and μc = 2/3.