Gas permeability of poly(bis-trifluoroethoxyphosphazene) and blends with adamantane amino/trifluoroethoxy (50/50) polyphosphazene

Kazukiyo Nagai, Benny D. Freeman, Angela Cannon, Harry R. Allcock

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Gas permeability coefficients of poly(bis-trifluoroethoxyphosphazene), (PTFEP) and its blends with adamantane amino/trifluoroethoxy polyphosphazene (PAdATFEP) containing adamantane groups on 50mol% of the side chains were determined at 35°C. The PTFEP films prepared by both spin casting and solvent casting had the same permeability coefficients, within the precision of the measurements. PTFEP/PAdATFEP blends were phase-separated. Relative to pure PTFEP, gas permeabilities were reduced from 45 to 70% (depending on the penetrant) by blending 18.8mol% of PAdATFEP with PTFEP. The permeability coefficients of low-sorbing, permanent gases (i.e. H2, O2, and N2) decreased as penetrant size increased, suggesting that such polymers sieve these permanent gas molecules primarily based on penetrant size rather than penetrant solubility. Gas permeation properties of CO2 and hydrocarbon vapors did not change monotonically with penetrant size, suggesting an interplay of gas diffusivity and gas solubility on overall gas permeability. Blending PAdATFEP with PTFEP increased gas selectivity. Ideal separation factors of these PTFEP/PAdATFEP blends were significantly below upper bound values. Copyright (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)167-176
Number of pages10
JournalJournal of Membrane Science
Volume172
Issue number1-2
DOIs
StatePublished - Jul 1 2000

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Fingerprint Dive into the research topics of 'Gas permeability of poly(bis-trifluoroethoxyphosphazene) and blends with adamantane amino/trifluoroethoxy (50/50) polyphosphazene'. Together they form a unique fingerprint.

  • Cite this