Continuity of solvent quality in polymer solutions. Poor-solvent to θ-solvent continuity in some polystyrene solutions

Attila Imre, W. Alexander Van Hook

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Critical temperatures for polystyrene/methyl acetate (PS/MA) and polystyrene/ethyl formate (PS/EF) solutions were measured at positive (PS/MA, PS/EF) and negative (PS/MA) pressure. The results confirm that solvent quality is sensitive to pressure; some solvents, designated Θ, at Pnominal ∼ 0, undergo a Θ-to-poor transition at negative pressure, and others, nominally designated "poor," show a poor-to-Θ transition at positive pressure. Thus, any dichotomous division into sets of "poor" and "Θ" solvents is inaccurate, unless it accounts for the effects of pressure and other variables on solvent quality.

Original languageEnglish
Pages (from-to)1251-1259
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume35
Issue number8
DOIs
Publication statusPublished - Jun 1997

Keywords

  • Consolute temperatures
  • Demixing
  • Ethyl formate
  • Methyl acetate
  • Negative pressure
  • Phase equilibria
  • Polystyrene
  • Pressure
  • Solvent

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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