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Title: Novel hollow fiber membranes with defined unit-step morphological change
Authors: Chung, T.-S. 
Tun, C.M.
Pramoda, K.P. 
Wang, R.
Keywords: PBI
PBI blend fibers
PBI/polysulfone fiber
PBI/polysulfone membranes
Issue Date: 31-Oct-2001
Citation: Chung, T.-S., Tun, C.M., Pramoda, K.P., Wang, R. (2001-10-31). Novel hollow fiber membranes with defined unit-step morphological change. Journal of Membrane Science 193 (1) : 123-128. ScholarBank@NUS Repository.
Abstract: We have found that sharply defined unit-step morphological changes can be created in the middle of the cross-section of hollow fiber membranes wet-spun from highly concentrated immiscible poly(2,2′-m-phenylene)-5,5′-polybenzimidazole (PBI) and polysulfone (PSf) blend solutions. A halo is observed with yellowish color having wavelength in the range 580-595nm. The abrupt change in transmittance light implies distinct morphological changes at the interface because the halo region possesses significantly different morphology and pore sizes from the inner and outer regions. The width of the halo ring is approximately 18-20% of the hollow fiber wall thickness. The mapping image and spectra obtained from field emission scanning electron microscopy coupled with energy dispersive X-ray analysis (FESEM-EDX) suggest that the distribution of the elements present in hollow fiber is homogeneous. X-ray photoelectron spectroscopic (XPS) results indicate that the halo formation is not caused by the phase separation of PBI and PSf, but by a physical phenomenon. © 2001 Elsevier Science B.V. All rights reserved.
Source Title: Journal of Membrane Science
ISSN: 03767388
DOI: 10.1016/S0376-7388(01)00529-4
Appears in Collections:Staff Publications

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