Abstract
Cross-linked urethane/urea membranes with two soft segments, polypropylene oxide and more hydrophobic polybutadiene, were prepared by extending a polypropylene oxide-based tri-isocyanate-terminated prepolymer (PU) with polybutadiene diol (PBDO). The membranes obtained were analysed with relation to the structure of phase-separation, degree of cross-linking and gas permeation. The PU/PBDO membranes showed different degrees of cross-linking and different degrees of phase separation according to the variation of the ratio of PU and PBDO. It was found that the CO 2 permeability of the membranes is dependent on the feed pressure and the ratio of PU/PBDO. A 67 wt.% PBDO membrane has a lower degree of cross-linking and displays a linear behaviour of CO 2 permeability vs. pressure, ranging from 90 to 550 barrer. A 20 wt.% PBDO membrane has a higher degree of cross-linking and displays phase separation, leading to higher CO 2 permeability, ranging from 150 to 950 barrer.
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