Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0376-7388(97)00101-4
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dc.titleFormation of ultrathin high-performance polyethersulfone hollow-fiber membranes
dc.contributor.authorChung, T.S.
dc.contributor.authorTeoh, S.K.
dc.contributor.authorHu, X.
dc.date.accessioned2014-10-09T08:18:34Z
dc.date.available2014-10-09T08:18:34Z
dc.date.issued1997-10-01
dc.identifier.citationChung, T.S., Teoh, S.K., Hu, X. (1997-10-01). Formation of ultrathin high-performance polyethersulfone hollow-fiber membranes. Journal of Membrane Science 133 (2) : 161-175. ScholarBank@NUS Repository. https://doi.org/10.1016/S0376-7388(97)00101-4
dc.identifier.issn03767388
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/91481
dc.description.abstractWe have demonstrated, for the first time, that ultrathin skin-layer hollow-fiber membranes with a skin layer of 474 Å can be prepared using mainly a one-polymer and one-solvent system. This is one of the thinnest skin-layer asymmetric hollow-fiber membranes that have ever been reported in the literature for air and gas separation. This work implies that, in order to yield a high-permeance polyethersulfone (PES) membrane with a skin layer of approximatey 500 Å, the addition of non-solvents into spinning dopes may not be the pre-condition to form ultrathin skin-layer hollow-fiber membranes for gas separation. The keys to fabricate ultrathin skin-layer hollow-fiber membranes are (1) to control the chemistry of the internal coagulant and the bore-fluid flow rate and (2) to have a dope exhibiting significant chain entanglement. The newly developed polyethersulfone (PES) hollow fibers have an O2/N2 selectivity of 5.80 with a permeance of 9.3 x 10-6 cc(STP)/cm2 s cmHg for O2 at room temperature. The skin layer thickness was calculated to be 474 Å. These hollow fibers were wet-spun from a 35/75 (weight ratio) PES/N-methyl-pyrrolidone (NMP) dope using water as the external coagulant and 80/20 NMP/H2O as the bore fluid. The hollow fiber must be coated with a silicone elastomer. This work also suggests that in order to yield a high-permeance PES membrane with a skin layer of approximately 500 Å, there might not exist a critical solvent molar volume when preparing the dope solvent mixture, as previously suggested by the Permea research group. SEM observation of skin nodules suggests that the skin layer thickness is less than 700 Å.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/S0376-7388(97)00101-4
dc.sourceScopus
dc.subjectAir-separation membranes
dc.subjectAsymmetric membranes
dc.subjectHollow fiber spinning
dc.subjectPolyethersulfone membranes
dc.subjectUltrathin skin layer
dc.typeArticle
dc.contributor.departmentCHEMICAL ENGINEERING
dc.description.doi10.1016/S0376-7388(97)00101-4
dc.description.sourcetitleJournal of Membrane Science
dc.description.volume133
dc.description.issue2
dc.description.page161-175
dc.description.codenJMESD
dc.identifier.isiutA1997XY73500003
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