Effects of film thickness on density and gas permeation parameters of glassy polymers

A. M. Shishatskii*, Yu P. Yampol'skii, Klaus-Victor Georg Peinemann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations


Dense films of poly(vinyltrimethyl silane) (PVTMS) and poly(trimethylsilyl norbornene) (PTMSNB) having different thicknesses in the range l = 5-150 μm were cast from hydrocarbon solutions. It was shown that a density is inversely proportional to the film thickness. The following equation holds for the density p: 1/p = 1/p(D) - b/l, Permeability and diffusion coefficients were determined using the time lag method in respect to different gases. For all the gases, diffusion coefficients decrease when film thickness decreases and film density increases, A correlation of diffusion coefficients with fractional free volume were demonstrated, On the other hand, permeability coefficients are nearly independent of the thickness and density, Possible mechanisms of this behavior are discussed.

Original languageEnglish (US)
Pages (from-to)275-285
Number of pages11
JournalJournal of Membrane Science
Issue number2
StatePublished - Apr 17 1996


  • Density
  • Diffusion coefficient
  • Permeability
  • Poly(trimethylsilyl norbornene)
  • Poly(vinyltrimethyl silane)

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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