CO2/N2 separation ability and structural characteristics of poly(butadiene-co-acrylonitrile)-based polyurethanes and hydrogenated nitrile rubbers

Authors

  • Aleksandra Wolińska-Grabczyk,

    Corresponding author
    1. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 41-819 Zabrze, M. Curie-Skłodowskiej 34, Poland
    • Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 41-819 Zabrze, M. Curie-Sk[swsl]lodowskiej 34, Poland
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  • Andrzej Jankowski

    1. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 41-819 Zabrze, M. Curie-Skłodowskiej 34, Poland
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Abstract

Two families of rubbery polymers, commercial hydrogenated nitrile rubbers and synthesized poly(acrylonitrile-co-butadiene)-based polyurethanes with different amount of nitrile groups were studied as CO2 selective membrane materials. The polymers were characterized by the techniques of FTIR, gel permeation chromatography, WAXD, and differential scanning calorimetry. The permeabilities of pure CO2 and N2 were measured using constant pressure/variable volume method at a feed pressure of 6 atm. With a higher amount of polar nitrile group within a given family of polymers, the permeability coefficient (P) was found to decrease, while the permselectivity (α) of these membranes was found to increase. The trade-off between both transport parameters was less severe for the polyurethanes, which also showed much higher permeabilites. The results obtained were also discussed with respect to the polymer structure, and some relationships were found between P and Tg values. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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