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- W4362465643 startingPage "123725" @default.
- W4362465643 abstract "Membrane-based gas separation technique shows great potential in CO2 elimination from natural gas and N2 enrichment from compressed air. In this study, a double-decker-shaped phenyl-substituted silsesquioxane (DDSQ)-based diamine monomer, that is, DDSQ-diamine, was synthesized and subsequently copolymerized with 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) in combination with 4,4′-oxydianiline (ODA) to fabricate a series of DDSQ-based polyimide membranes with intrinsic microporosity (PIM-PIs). The resulting membranes showcase desirable mechanical robustness, satisfactory heat resistance and good organo solubility. Owing to the inherent internal nanometer-sized cavity of DDSQ cage, DDSQ-based membranes are more nanoporous than DDSQ-free sample, accordingly exhibiting decreasing membrane density and increasing gas permeability. Among all membranes, DDSQ-25 and DDSQ-50 show more desirable overall gas separation performance, which almost achieve the 1991 Robeson upper bound. Additionally, DDSQ-25 demonstrates good plasticization resistance and CO2/CH4 mixed-gas separation properties when measured with 50:50 CO2/CH4 binary gas mixture at upstream pressure up to 20 bar. Despite physical aging at ambient conditions for 300 days, the resultant DDSQ-based polyimide membranes still have stable gas permeability and almost constant selectivity, showcasing satisfactory anti-aging characteristic." @default.
- W4362465643 created "2023-04-05" @default.
- W4362465643 creator A5001753313 @default.
- W4362465643 creator A5023363049 @default.
- W4362465643 creator A5026704485 @default.
- W4362465643 creator A5072518403 @default.
- W4362465643 creator A5083806541 @default.
- W4362465643 creator A5091399484 @default.
- W4362465643 date "2023-06-01" @default.
- W4362465643 modified "2023-09-23" @default.
- W4362465643 title "Double-decker-shaped phenyl-substituted silsesquioxane (DDSQ)-based nanocomposite polyimide membranes with tunable gas permeability and good aging resistance" @default.
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