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• W2890129610 abstract "This work studies useful routes to produce cross-linked poly(oxyindole biphenylylene) bearing a cross-linkable propargyl group, PNPr. Thus, the effect of cross-linking temperature and time on gas permeability and ideal selectivity for a non-cross-linked PNPr membrane to produce a cross-linked PNPr membrane is studied in detail in order to learn how more productive membranes, in terms of permeability–selectivity combinations, and membranes resistant to solvent swelling and CO2 plasticization may be produced. Systematic studies on structure/processing/property relationship assessed by Fourier transform infrared attenuated total reflectance (FTIR-ATR), gel content (GC [%]), swelling degree (SD [%]), specific volume, wide-angle X-ray diffraction (WAXD), and gas permeability measurements reveal that PNPr membranes cross-linked under vacuum (1 mmHg) at 190 °C for 24 h, and further vacuum-annealed for 1584 h, at 35 °C and 10–3 mmHg, produce membranes that overcome the typical trade-off between permeability and selectivity. In effect, the thermally cross-linked membranes annealed under vacuum for 1584 h, as compared to the non-cross-linked membranes, possess P(H2) and P(CO2) that increase by 2.4 and 2.1 factors while selectivity increases from 25 to 45 for the H2/CH4 pair and from 25 to 39 for the CO2/CH4 pair, whereas P(O2) increases by a 2.4 factor with an associated increase in selectivity from 4.4 to 9.6 for O2/N2 which situates this membrane above Robeson’s 2008 upper-bound limit, at least for this pair of gases. The cross-linked membranes are resistant to solvent selling, since their SD [%] in NMP is on the order of 1–3%, and also to CO2 plasticization since the plasticization pressure was not observed at least up to the 18 bar upstream pressure studied here." @default.
• W2890129610 created "2018-09-27" @default.
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• W2890129610 date "2018-09-05" @default.
• W2890129610 modified "2023-10-16" @default.
• W2890129610 title "Gas Transport Properties in Cross-Linked and Vacuum Annealed Poly(oxyindole biphenylylene) Membranes" @default.
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• W2890129610 doi "https://doi.org/10.1021/acs.iecr.8b02735" @default.
• W2890129610 hasPublicationYear "2018" @default.
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