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- W2890623451 abstract "The transport properties of ionic liquid (IL)/sulfonated polyimide (SPI) composite membranes for CO2 separation were explored in relation to their nanostructures. 1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([C4mim][NTf2]), 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim]PF6), and 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide ([P14][NTf2]) were selected as the ILs. These composite membranes enable favorable CO2 separation and superior mechanical properties. SPI is plasticized by the IL, which induces a decrease in the elastic modulus; however, due to the formation of bicontinuous nanostructures of IL-rich and SPI-rich phases, a modulus of >10 MPa is retained even with the incorporation of 75 wt % IL. [C4mim][NTf2] and [C4mim]PF6 exhibit stronger plasticization effects on SPI than [P14][NTf2]. The diffusion coefficients of CO2 and N2, which were measured by the time-lag method, abruptly increase with increasing IL content in the [C4mim][NTf2]/SPI composite membranes, which coincided with a change from an isolated to a continuous IL-rich phase structure. On the other hand, the selective solubility of CO2 in the [C4mim][NTf2]/SPI composite membranes exhibits no relation with the IL content. Consequently, the permeation coefficient (PCO2) of the membranes increases with increasing IL content without decreasing the separation factor (αCO2/N2), showing PCO2 = 431 barrer and αCO2/N2 = 30 at 30 °C." @default.
- W2890623451 created "2018-09-27" @default.
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- W2890623451 date "2018-09-07" @default.
- W2890623451 modified "2023-10-12" @default.
- W2890623451 title "Sulfonated Polyimide/Ionic Liquid Composite Membranes for CO<sub>2</sub> Separation: Transport Properties in Relation to Their Nanostructures" @default.
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- W2890623451 doi "https://doi.org/10.1021/acs.macromol.8b01135" @default.
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