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Issue 44, 2016
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Plasticization resistant crosslinked polyurethane gas separation membranes

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Polyurethanes (PUs) with good film formation ability and high gas separation properties are promising materials for gas separation membranes. However, low mechanical properties and high CO2 plasticization limit the industrial application of these membranes. Here, we synthesized a crosslinkable PU structure using a 1 : 3 : 2 molar ratio of Pluronic L61, isophorone diisocyanate (IPDI) and 3,5-diaminobenzoic acid (DABA). In order to improve both mechanical properties and plasticization resistance, a series of crosslinking agents with different chain lengths and functionalities were used to crosslink the PU via an esterification-based reaction. Pure (H2, CO2, N2, CH4, and C2H6) and mixed (CO2/N2 and CO2/CH4) gas permeability experiments were performed on the crosslinked PU (XPU) membranes. The XPU membranes showed enhanced mechanical properties and chemical stability and improved plasticization resistance to an extent about three times higher than the non-crosslinked PU and commercial membranes (PEBAX® 2533). Mechanical tests indicated an improvement of over 600% in Young's modulus and 200% in hardness for XPUs compared to the pristine PU. The resulting crosslinked membranes with high CO2 separation performance (CO2/N2 ∼ 30) and superior thermal and mechanical properties are attractive candidates for industrial separation processes.

Graphical abstract: Plasticization resistant crosslinked polyurethane gas separation membranes

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Publication details

The article was received on 09 Sep 2016, accepted on 10 Oct 2016 and first published on 10 Oct 2016

Article type: Paper
DOI: 10.1039/C6TA07820F
Citation: J. Mater. Chem. A, 2016,4, 17431-17439
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    Plasticization resistant crosslinked polyurethane gas separation membranes

    A. P. Isfahani, B. Ghalei, K. Wakimoto, R. Bagheri, E. Sivaniah and M. Sadeghi, J. Mater. Chem. A, 2016, 4, 17431
    DOI: 10.1039/C6TA07820F

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