Pure hydrocarbon sorption properties of poly(1-trimethylsilyl-1-propyne) (PTMSP), poly(1-phenyl-1-propyne) (PPP), and PTMSP/PPP blends

A. Morisato, B. D. Freeman*, I. Pinnau, C. G. Casillas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Propane and n-butane sorption in blends of poly(1-trimethylsilyl-1-propyne) (PTMSP) and poly(1-phenyl-1-propyne) (PPP) have been determined. Solubilities of propane and n-butane increased as the PTMSP content in the blends increased. This result is consistent with the higher free volume of PTMSP-rich blends and the better thermodynamic compatibility between PTMSP and these hydrocarbons. Propane and n-butane sorption isotherms were well described by the dual-mode model for sorption in glassy polymers. PTMSP/PPP blends are strongly phase-separated, heterogeneous materials. A noninteracting domain model developed for sorption in phase-separated glassy polymer blends suggests that sorption in the Henry's law regions (i.e., the equilibrium, dense phase of the blends) is consistent with the model. However, Langmuir capacity parameters in the blends are lower than predicted from the domain model, suggesting that the amount of nonequilibrium excess free volume associated with the Langmuir sites depends on blend composition.

Original languageEnglish (US)
Pages (from-to)1925-1934
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number11
StatePublished - Aug 1996
Externally publishedYes


  • Blends
  • Hydrocarbons
  • Poly(1-phenyl-1-propyne)
  • Poly(1-trimethylsilyl-1-propyne)
  • Sorption
  • Sorption models

ASJC Scopus subject areas

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


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