TY - JOUR
T1 - Gas Permeation and Selectivity of Poly(organophosphazene) Membranes
AU - Allcock, Harry R.
AU - Nelson, Constance J.
AU - Coggio, William D.
AU - Manners, Ian
AU - Koros, William J.
AU - Walker, David R.B.
AU - Pessan, Luiz A.
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
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U2 - 10.1021/ma00059a003
DO - 10.1021/ma00059a003
M3 - Article
AN - SCOPUS:0027558012
SN - 0024-9297
VL - 26
SP - 1493
EP - 1502
JO - Macromolecules
JF - Macromolecules
IS - 7
ER -