Abstract
AbstractAttempts were made to explain the cosolvency or the solubilisation of polystyrene in cyclohexane/acetone mixtures at 30°C. Cyclohexane is a Φ‐solvent for polystyrene at 35°C. and acetone is a non‐solvent. The effective interaction parameter χms of Scott has been determined for the optimum solvent composition from the slope of a Stockmayer‐Fixman plot as modified by Yamakawa. The value of unperturbed dimension obtained for polystyrene at this solvent composition coincides very well with that obtained in cyclohexane (Θ‐solvent). The binary interaction parameter χ12, between the two liquids obtained from χms shows a certain amount of incompatibility between them. The values of λ*, the preferential adsorption coefficient, were calculated for the entire solvent spectrum assuming the binary interaction parameters χij as being independent of solvent composition. The inversion point (λ* = 0), the optimum solvent composition yielding [η]max, and the importance of χ123, the ternary interaction parameter, are discussed.
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