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Home  >  Journal list  >  Polymer Journal  >  Vol.49  No.9 (2017)  >  pp.671-676

Polymer Journal
<<Previous article Vol.49  No.9 (2017)   pp.671 - 676 Next article>>

Sulfonated polyimide/ionic liquid composite membranes for carbon dioxide separation

Akika Ito1,3, Tomohiro Yasuda2,3, Xiaofeng Ma1 and Masayoshi Watanabe1
1Department of Chemistry and Biotechnology, Yokohama National University, Yokohama, Japan
2Research and Development Division, Institute for Catalysis, Hokkaido University, Sapporo, Japan

A series of composite membranes (SPI-NTf2 and SPI-PF6) consisting of a sulfonated polyimide (SPI) and an ionic liquid (IL), either [C4mim][NTf2] or [C4mim]PF6, where [C4mim] and [NTf2] stand for 1-butyl-3-methylimidazolium and bis(trifluoromethanesulfonyl)amide, respectively, were prepared, and their thermal, mechanical and gas (carbon dioxide (CO2) and N2) permeation properties were systematically investigated. The ILs functioned as plasticizers of the SPI, making the composite membranes softer (lower Young’s modulus and larger elongation at break). However, SPI-NTf2 (75), containing 75wt% [C4mim][NTf2], still exhibited a Young’s modulus higher than 10MPa, which is much higher than that reported for common IL/polymer composites. The SPI membrane behaved as a gas barrier membrane; however, the addition of IL greatly enhanced gas permeability. Consequently, SPI-NTf2 (75) exhibited CO2 permeability () of 412 Barrer at 30°C and selectivity against N2 () of 27. The SPI-PF6 composite membranes showed similar behavior; however, gas permeability exhibited by these membranes was lower than that exhibited by the SPI-NTf2 composite membranes. In permeation tests under mixed-gas conditions, the value decreased than that under single-gas conditions, whereas increased, and decreased (from the range 29−27 to 12–16).


Received: February 24, 2017 , Revised: May 10, 2017
Accepted: May 18, 2017 , Published online: June 21, 2017
© 2017 The Society of Polymer Science, Japan

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