Using the phase diagram of polydstyrene and DOP below, would you expect a single phase solution or a two phase solution at i. 1 °C? ii. 15 °C? 20- 15- 10 -10 0.00 0.05 0.10 Volume Fraction of Polymer Solution Above the binodal curve, a one phase solution exists and below it, a two phase solution. Hence, at 0 0C two phase and at 15 0C one phase.