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Title: UV-rearranged PIM-1 polymeric membranes for advanced hydrogen purification and production
Authors: Li, F.Y. 
Xiao, Y.
Ong, Y.K. 
Chung, T.-S. 
Issue Date: Dec-2012
Citation: Li, F.Y., Xiao, Y., Ong, Y.K., Chung, T.-S. (2012-12). UV-rearranged PIM-1 polymeric membranes for advanced hydrogen purification and production. Advanced Energy Materials 2 (12) : 1456-1466. ScholarBank@NUS Repository.
Abstract: Polymers of intrinsic microporosity (PIM-1) have been known for their super high permeability but average selectivity for medium-size gas pairs. They have unimpressive selectivity for H2 and CO2 separation (i.e., α (H2/CO2) = 0.6). For the first time, we have discovered that ultraviolet (UV)-rearranged polymers of PIM-1 membranes can be used for H2/CO2 separation with far superior separation performance to others in literatures. The PIM-1 membrane after UV radiation for 4 hours shows H2 permeability of 452 barrer with H 2/CO2 selectivity of 7.3. Experimental data and molecular simulation reveal that the polymer chains of PIM-1 undergo 1,2-migration reaction and transform to close-to-planar like rearranged structure after UV radiation. As a result, the UV-irradiated PIM-1 membrane shows considerable drops in both fractional free volume (FFV) and size of micro-pores. Positron annihilation lifetime (PAL) results have confirmed the chemical and structural changes, suggesting the FFV and pore size drops are mainly ascribed to the destructed spiro-carbon centre during UV radiation. Sorption and x-ray diffractor (XRD) analyses indicate that the impressive H2/CO 2 selectivity arises from the significantly enhanced diffusivity selectivity induced by UV radiation, followed by molecular rearrangement, conformation change and chain packing. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA.
Source Title: Advanced Energy Materials
ISSN: 16146832
DOI: 10.1002/aenm.201200296
Appears in Collections:Staff Publications

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