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- W1999687110 abstract "Polyurethane prepolymers were prepared in ethylacetate from TDI and poly(oxypropilene)glicols) (PE-PU) or poly(tetramethyleneglycoladipate)diols (PES-PU) of different molecular weights (M). Homogeneous membranes were prepared by spreading the pre-polymer solution added with a three, four or pentafunctional crosslinking agent, in the presence of stannous octoate as a catalyst. On increasing M, the PUs Tg decreases regularly in the range +30 to −47°C. PU's are amorphous with the exception of PES-PU obtained from highest M polyester diols. Permeability P, diffusivity D, solubility coefficient S of N2, O2, CO2, CH4, CO were measured at T=35°C (>Tg).P, D, S do not depend on the crosslinker functionality, but mainly on M. P and D in PE-PU are linear function of T-Tg while in PES-PU the function is not linear. Gas solubility fulfills in general the regular solution theory. P, D, S of water vapor is also given. Permeability decreases in the order H2O>CO2 > O2 > CH4 > CO > N2. Some practical application based on particular selectivities is suggested." @default.
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- W1999687110 date "1991-08-20" @default.
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- W1999687110 title "Polyurethane membranes from polyether and polyester diols for gas fractionation" @default.
- W1999687110 doi "https://doi.org/10.1002/app.1991.070430406" @default.
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