Abstract
Three-phase coexistence curves, a cloud point curve and a shadow curve were observed for the system polystyrene I ( M w = 1.73 × 10 4) + polystyrene II ( M w = 7.19 × 10 5) + methylcyclohexane with different overall volume fractions of polystyrene and a constant volume fraction of polystyrene II in total polystyrene of 0.0500. The observed cloud point curve and shadow curve intersected each other when extrapolated below the three-phase temperature region. The intersection was interpreted as a metastable critical point by comparing it with a phase diagram calculated from an empirically determined free energy. A simple method for determining the entire three-phase coexistence curve was demonstrated by the calculated three-phase behavior.
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