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Abstract
Osmotic pressure measurements were performed on solutions of polystyrene in trans-decaline in the temperature range from 20° to 90 °C and in concentrations of segment fraction φ2 ranging from 0.06 to 0.26. The cloud-point curves for this system were observed for samples of molecular weights from 3.7 to 270×104. Values of the interaction parameter χ obtained from osmotic pressure data were compared with those calculated from the new Flory theory for liquid mixtures. The behavior of χ was well represented by the simple relation: χ= (127.1+72.6φ2+48.7φ22)/T +(2.32×10−4+2.07×10−4φ2) T, where the terms proportional to temperature and to reciprocal temperature were found to be ascribed mainly to the difference of the liquid properties of the respective components and the exchange energy, respectively. Behaviors of the cloud-point curves were well explained by the above expression for χ.
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