Turkish Physical Society–38th International Physics Congress (TPS-38, Muğla, Türkiye, 31 Ağustos - 04 Eylül 2022, ss.318
We obtained the global phase diagrams (GPDs) for
polymer-solvent mixtures by using the modified Tompa model. We construct the
Griffiths shield regions (GSRs), the zones that interaction energies are almost
equal, are obtained on the GPDs. We examine and discuss the influences of
various segment sizes of polymer molecules on the GPDs and the GSRs. We observe
that the GPDs are symmetrical around ζ=0 for the equal-size segments of polymer
molecules and the break down in the symmetric features of the GPDs rises as
differences of segments of polymer molecules rise. Moreover, the types IV*, VI
and VII phase behaviors are seen for differences of segments of polymer
molecules in addition to the types I, I-A, II, II-A, III, III-HA, IV, V and V-A
according to the van Konynenburg and Scott binary fluid phase behavior
classification. It is also observed that differences in the polymer
molecules segments effect on the sizes of the phase type domains and the types
of phase behaviors.