Abstract
A λ-shaped cell made with main and side tubes had been used to determine cloud-point curves (CPCs) of the ternary system nitroethane (NE)+cyclohexane (CH)+polystyrene (PS) by visual observation. Without being exposed to air, PS (Mw=4.8×104) in the main tube was diluted by the mixed solvent in the side tube step by step by inclining the cell. This novel device eliminated scattering of cloud-point data due to impurities. The observed CPCs at constant composition of the mixed solvent have been converted into CPCs at constant compositions of PS and binodals on a composition triangle. The cloud-point temperatures of the binary system NE+PS decreased rapidly by the presence of small amounts of CH, indicating cosolvency. The cloud point temperatures of CH+PS increased by the presence of NE. The latter behavior could vary depending on the molecular weight of PS. The cloud-point temperatures near the critical composition of NE+CH decreased by the addition of PS.
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