Abstract
The three phase separation was obtained for the ternary system of ethylene glycol diacetate (EGDA) + methylcyclohexane (MCH) + polystyrene (PS) with the molecular weight (Mw = 4.8 × 104 g/mol). A phase equilibrium experiment was carried out to determine binodals and three phase triangles. With decreasing temperature the three phase separation appears at 35.0 °C in the two phase region spreading from the EGDA-MCH side protruding a new binodal with a critical point on a composition triangle. The binodal spreading from the EGDA-PS side merges with the binodal from EGDA-MCH side at 34.0 °C via a critical point, while the binodal from MCH-PS side merges with the new binodal at 32.9 °C. Thus, the binodal surface in a prism diagram of composition triangle and temperature has two saddle points at which a critical line has a minimum.
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