Gas Permeation and Selectivity of Poly(organophosphazene) Membranes

Harry R. Allcock, Constance J. Nelson, William D. Coggio, Ian Manners, William J. Koros, David R.B. Walker, Luiz A. Pessan

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Abstract

A series of poly(organophosphazenes) with the general structure [NP(R)x(OC6H5)2−x]n, where x ≤ 2 and R = OC6H4SiMe3, OC6H4SiMe2Ph, OC6H4SiMePh2, OC6H4Br, and OCH2CF3, and the ferrocenyl polymer [N3P3(OCH2CF3)4(η-C5H4)2Fe]n were synthesized. Molecular structural characterization for these polymers was achieved by 1H and 31P NMR, gel permeation chromatography, elemental microanalysis, and differential scanning calorimetry. Films of these polymers were examined with respect to their permeability to O2, N2, CO2, He, and CH4, and selectivity ratios were established. The effect of cross-linking on both the permeation and selectivity values for films of the silyl-bearing polymers was also investigated. The change in permeability and selectivity as a function of side group structure variations, free volume effects, gas pressure, and glass transition temperature (Tg) is discussed. Poly[bis(trifluoroethoxy)phosphazene] was found to have oxygen permeabilities comparable to those of poly(dimethylsiloxane) but with higher permselectivities.

Original languageEnglish (US)
Pages (from-to)1493-1502
Number of pages10
JournalMacromolecules
Volume26
Issue number7
DOIs
StatePublished - Jan 1 1993

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Allcock, H. R., Nelson, C. J., Coggio, W. D., Manners, I., Koros, W. J., Walker, D. R. B., & Pessan, L. A. (1993). Gas Permeation and Selectivity of Poly(organophosphazene) Membranes. Macromolecules, 26(7), 1493-1502. https://doi.org/10.1021/ma00059a003