Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0376-7388(97)00267-6
Title: Effect of liquid-liquid demixing on the membrane morphology, gas permeation, thermal and mechanical properties of cellulose acetate hollow fibers
Authors: Shieh, J.-J. 
Chung, T.S. 
Keywords: Binary solvent system
Bore fluid
Fiber property
Hollow fiber
Liquid-liquid demixing process
Issue Date: 4-Mar-1998
Source: Shieh, J.-J.,Chung, T.S. (1998-03-04). Effect of liquid-liquid demixing on the membrane morphology, gas permeation, thermal and mechanical properties of cellulose acetate hollow fibers. Journal of Membrane Science 140 (1) : 67-79. ScholarBank@NUS Repository. https://doi.org/10.1016/S0376-7388(97)00267-6
Abstract: The polymer/solvent/nonsolvent systems with different L-L demixing rates were prepared by employing a binary solvent mixture consisting of two solvents - one exhibits an instantaneous liquid-liquid (L-L) demixing process, while the other exhibits a delayed L-L demixing process. It was found that an increase in the delay time of L-L demixing results in a denser membrane structure, an increase in fiber mechanical strength, a delay desorption of moisture in membrane, and a decrease in gas permeance, for a hollow fiber fabrication system consisting of cellulose acetate (CA) (polymer), N-methyl-pyrrolidone (NMP) (solvent having an instantaneous L-L demixing property), tetrahydrofuran (THF) (solvent having a delayed L-L demixing property) and water (nonsolvent). Hollow fibers prepared under an instantaneous L-L demixing process tends to have more mechanically weak points (flaws) than those prepared under a delayed L-L demixing process. Surprisingly, SEM observation suggests that membranes wet-spun from solutions containing both THF and NMP tend to have a rough outer skin morphology. Inconsistent demixing and the collapse of the outer nascent skin may be the main causes. In addition, the effect of bore fluid chemistry on fiber performance is much more pronounced for systems having a delayed L-L demixing mechanism than that having an instantaneous L-L demixing.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/67415
ISSN: 03767388
DOI: 10.1016/S0376-7388(97)00267-6
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