THF/PS/PVME

The predictions of model calculations of the type shown in Fig. 33 were checked [74] by means of the systems THF/PS/PVME and CH/PS/PVME. This choice was made because of the availability of the thermodynamic information for all binary subsystems. One of the questions to be answered by this comparison between theory and experiment concerns the extent to which the phase behavior of the ternary system can be predicted if the corresponding information for the binary subsystems is available. 

Fig. 34 Measured and calculated phase diagram for the THF/PS/PVME system at 20°C. Circles show measured cloud points. The modeling was performed by means of (60) and the binary parameters are shown on the edges of the triangle. The calculated spinodal area is shaded. Open stars composition of the coexisting phases, closed stars critical points [74]...

Figure 34 shows how experiment and the prediction by means of (60) compare in the case of THF the data for THF/PS and THF/PVME were taken from [75] and that for the polymer blend from [59]. 

Figure 7. Concentration dependence of 1])/% for miscible PS/PVME blends cast from toluene (circles) and immiscible blends cast from tetrahydrofuran (squares). The solid line through the toluene cast film data is the best fit of the spatially periodic model, while the solid line through the THF results is the best fit of the two phase model. Taken from Figure I of reference 79.

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