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- W2059578313 abstract "The effect of chemical structure and fabrication variables on the gas permeability of several block copolyether—urethane—urea and copolyether—urethane membranes was determined. It was found that the gas permeability of the copolyether—urethane—ureas increased in a linear manner with an increase in the polypropylene glycol segment molecular weight. Copolymers with a polyethylene glycol segment were found to be less permeable than those with propylene glycol segments. This may be due to the ability of polyethylene glycol to crystallize. For both copolymer systems, the type of chain extender used affected gas permeability. Again, these effects may be due to the degree of phase separation and to the nature of chain packing with the different extenders (i.e., the better the packing the lower the permeability). Changes in casting solvent, or the addition of salts such as LiBr or urea, had only minor effects on gas permeability." @default.
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- W2059578313 date "1984-02-01" @default.
- W2059578313 modified "2023-10-16" @default.
- W2059578313 title "Gas permeability of various block copolyether—urethanes" @default.
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- W2059578313 doi "https://doi.org/10.1016/s0376-7388(00)83216-0" @default.
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