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Title: Chemical cross-linking modification of polyimide/poly(ether sulfone) dual-layer hollow-fiber membranes for gas separation
Authors: Liu, Y.
Chung, T.-S. 
Wang, R.
Li, D.F.
Chng, M.L.
Issue Date: 19-Mar-2003
Citation: Liu, Y.,Chung, T.-S.,Wang, R.,Li, D.F.,Chng, M.L. (2003-03-19). Chemical cross-linking modification of polyimide/poly(ether sulfone) dual-layer hollow-fiber membranes for gas separation. Industrial and Engineering Chemistry Research 42 (6) : 1190-1195. ScholarBank@NUS Repository.
Abstract: A novel engineering approach on cross-linking modification of polyimide hollow-fiber membranes is reported. The concept is demonstrated using a dual-layer hollow-fiber membrane structure, where a polyimide {copoly[1,4-durene/1,3-phenylene-2,2-bis(3,4-dicarboxyphenyl) hexafluoropropanediimide] (6FDA-durene/mPDA) (50:50)} is chosen as the outer layer and poly(ether sulfone) (PES) is selected as the inner layer. Chemical cross-linking modification occurs at the outer polyimide layer by immersing the dual-layer hollow fibers in a 5% (w/v) p-xylenediamine/methanol solution at ambient temperature for a short period of time. Fourier transform infrared studies show that chemical cross-linking modification takes place by the formation of amide groups through the reactions between p-xylenediamine and imide groups. The PES inner layer is found to be immune from the proposed chemical cross-linking modification and remains porous and flexible as a supporting layer. Pure gas tests show that chemical cross-linking modification of dual-layer hollow fibers results in a reduction in permeance but significantly enhances the CO2/N2 and especially CO2/CH4 selectivities. The proposed chemical cross-linking modification also makes the polymer more resistant to plasticization and thus reduces the CO2-induced increase in gas permeance.
Source Title: Industrial and Engineering Chemistry Research
ISSN: 08885885
Appears in Collections:Staff Publications

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