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dc.titleAging phenomenon of 6FDA-polyimide/polyacrylonitrile composite hollow fibers
dc.contributor.authorChung, T.-S.
dc.contributor.authorKafchinski, E.R.
dc.identifier.citationChung, T.-S.,Kafchinski, E.R. (1996-01-03). Aging phenomenon of 6FDA-polyimide/polyacrylonitrile composite hollow fibers. Journal of Applied Polymer Science 59 (1) : 77-82. ScholarBank@NUS Repository.
dc.description.abstractWe have observed time-dependent drifts in permeability and selectivity for two types of composite hollow fibers used for air separation. One was PVP [poly(4-vinyl pyridine)]/ 6FDA-durene/polyacrylonitrile (PAN) composite hollow fiber, and the other was 6FDA-3,5-diaminobenzonitrile/6FDA-durene/PAN composite hollow fiber. Their permeabilities dropped 50 to 70% after 3 to 5 months, while selectivities for O2/N2 deteriorated slightly with time. A systematic study was carried out to investigate the causes of this creep behavior. Various composite fibers, such as polyimide/Celgard and polyimide siloxane/PAN, were fabricated to simulate the aging process. We conclude that the aging phenomenon observed for these two 6FDA-durene/PAN composite fibers was not due to the structure change of the PAN substrate, but mainly to the densification effect of the 6FDA-durene gutter layer on composite fibers. © 1996 John Wiley & Sons, Inc.
dc.contributor.departmentCHEMICAL ENGINEERING
dc.description.sourcetitleJournal of Applied Polymer Science
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