GL binodals

The Yukawa diagram (Figure 7.5a), for a onepressure increases with temperature in an Arrhenius-type fashion up to the critical point, and a GS curve at low temperature and pressure. 

Figure 25.10 Binodal (— —) and spinodal (- a -) curves for a binary liquid of n-hexane in n-tetradecafluorohexane. Source Gl Pozharskaya, NL Kasapova, VP Skripov and YD Kolpakov, J Chem Thermodyn 16, 267 (1984) WJ Caw and RL Scott, J Chem Thermodyn 3, 335 (1971).

Once expressions for p andpv (and the first and second derivatives p and p" with respect to q) have been found, the complete phase diagram for each system may be calculated. Binodal points and triple points follow from equal p and pv in two or three phases, respectively. Critical GL points are obtained from p = p" = 0. Of central importance for the existence of a stable liquid is the critical endpoint (cep) its... 

For var the polymer exclusion is less than in fix because of the compression of the depletion layers. Therefore, LS is not fully horizontal, but still pv = 6.08kT for small . GS is not straight, but for high e the same limit is approached as for fix. In addition, GL is also no longer a straight line. Nevertheless, the GL and GS binodals around tp follow a very smooth course. 

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