On the effect of pressure on the phase transition of polymer blends and polymer solutions: Oligostyrene n-alkane systems

A. R. Imre, G. Melnichenko, W. A. Van Hook, B. A. Wolf

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Critical temperatures of some binary solutions of weakly interacting low molecular weight polystyrenes dissolved in linear alkanes (oligoethylenes) were measured over the range 0.1 to 100 MPa. While (dT/dP)crit along the upper critical solution (UCS) locus for a "typical blend" is positive, and for the "typical solution" can be either positive or negative (but is usually negative), there is no essential difference between blend and solution. Rather, the difference in sign is a consequence of the location of the hypercritical point (that point in (T,P)crit space where (dT/dP)crit changes sign, [(dT/dP)crit = 0 and (d2T/dP2)crit > 0], also called the double critical point, DCP), which is normally found at P > 0 for solutions but is shifted to P < 0 for blends.

Original languageEnglish
Pages (from-to)1063-1066
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume3
Issue number6
DOIs
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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