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Issue 9, 2017
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Surface functionalization of high free-volume polymers as a route to efficient hydrogen separation membranes

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Abstract

There is a sparcity of polymeric membranes with sufficient selectivity for efficient hydrogen separation from syn-gas products, primarily carbon dioxide. Despite hydrogen's significantly smaller kinetic diameter, low selectivity arises as other gases are generally more condensable within typical polymeric membranes. Here we report an in situ-controllable, surface polymerization of polydopamine (PDA) and polyaniline (PANI) on high free-volume glassy polymer films, specifically the well studied polymer of intrinsic microporosity (PIM-1) and poly(1-trimethylsilyl-1-propyne) (PTMSP). The resulting nanolayer composite membranes demonstrate a remarkable hydrogen selectivity against N2, CH4 and CO2 (H2/CO2 ∼ 50). The PDA or PANI layers principally serve to increase the diffusive selectivity towards hydrogen whilst the high free volume supports of PIM-1 or PTMSP provide a highly permeable interface for defect-free growth of the selective layer. Whilst both PANI and PDA are effective, these selective layers were found to grow by heterogeneous or homogeneous modes respectively.

Graphical abstract: Surface functionalization of high free-volume polymers as a route to efficient hydrogen separation membranes

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Publication details

The article was received on 23 Oct 2016, accepted on 17 Jan 2017 and first published on 18 Jan 2017


Article type: Paper
DOI: 10.1039/C6TA09181D
Citation: J. Mater. Chem. A, 2017,5, 4686-4694
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    Surface functionalization of high free-volume polymers as a route to efficient hydrogen separation membranes

    B. Ghalei, Y. Kinoshita, K. Wakimoto, K. Sakurai, S. Mathew, Y. Yue, H. Kusuda, H. Imahori and E. Sivaniah, J. Mater. Chem. A, 2017, 5, 4686
    DOI: 10.1039/C6TA09181D

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