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Polyimide/polyethersulfone dual-layer hollow fiber membranes for hydrogen enrichment / Bee Ting Low in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8778–8786 Titre : Polyimide/polyethersulfone dual-layer hollow fiber membranes for hydrogen enrichment Type de document : texte imprimé Auteurs : Bee Ting Low, Auteur ; Natalia Widjojo, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2010 Article en page(s) : pp. 8778–8786 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hollow  fiber  membranes Résumé : We have developed functional poly(1,5-naphthalene-2,2′-bis(3,4-phthalic)hexafluoropropane diimide (6FDA-NDA)/polyethersulfone (PES) dual layer hollow fiber membranes and studied the H2/CO2 separation performance with and without 1,3-diaminopropane (PDA) modification. The effects of air gap on the membrane gas transport properties are investigated and it is observed that the optimal air gap for maximizing the ideal permselectivity is strongly dependent on the kinetic diameters of gas pair molecules. A higher air gap diminishes the population of Knudsen pores in the apparently dense outer skin and induces greater elongational stresses on polymer chains. The latter enhances polymer chain alignment and packing which possibly results in the shift and sharpening of the free volume distribution. The diamine modification of 6FDA-NDA/PES dual layer hollow fiber membranes effectively enhances the H2/CO2 permselectivity and suppresses the CO2-induced plasticization. At higher temperatures, the H2 permeance of the PDA-modified fibers increases with negligible decrease in the H2/CO2 permselectivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1008986 [article] Polyimide/polyethersulfone dual-layer hollow fiber membranes for hydrogen enrichment [texte imprimé] / Bee Ting Low, Auteur ; Natalia Widjojo, Auteur ; Tai-Shung Chung, Auteur . - 2010 . - pp. 8778–8786. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8778–8786 Mots-clés : Hollow  fiber  membranes Résumé : We have developed functional poly(1,5-naphthalene-2,2′-bis(3,4-phthalic)hexafluoropropane diimide (6FDA-NDA)/polyethersulfone (PES) dual layer hollow fiber membranes and studied the H2/CO2 separation performance with and without 1,3-diaminopropane (PDA) modification. The effects of air gap on the membrane gas transport properties are investigated and it is observed that the optimal air gap for maximizing the ideal permselectivity is strongly dependent on the kinetic diameters of gas pair molecules. A higher air gap diminishes the population of Knudsen pores in the apparently dense outer skin and induces greater elongational stresses on polymer chains. The latter enhances polymer chain alignment and packing which possibly results in the shift and sharpening of the free volume distribution. The diamine modification of 6FDA-NDA/PES dual layer hollow fiber membranes effectively enhances the H2/CO2 permselectivity and suppresses the CO2-induced plasticization. At higher temperatures, the H2 permeance of the PDA-modified fibers increases with negligible decrease in the H2/CO2 permselectivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1008986