Global phase diagrams for polymer-solvent mixtures within the modified Tompa model


Gençaslan M., Kuyumcu S., Keskin M.

Turkish Physical Society–38th International Physics Congress (TPS-38, Muğla, Turkey, 31 August - 04 September 2022, pp.318

  • Publication Type: Conference Paper / Summary Text
  • City: Muğla
  • Country: Turkey
  • Page Numbers: pp.318
  • Erciyes University Affiliated: Yes

Abstract

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.