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https://hdl.handle.net/10356/98627
Title: | Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance | Authors: | Ren, Jizhong. Li, Zhansheng. |
Issue Date: | 2011 | Source: | Ren, J., & Li, Z. (2012). Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance. Desalination, 285, 336-344. | Series/Report no.: | Desalination | Abstract: | In this paper, the effects of γ-butyrolactone (GBL) weight ratio (wGBL) and membrane thickness on the formation of asymmetric flat sheet membranes prepared with P84 (BTDA-TDI/MDI co-polyimide)/N-methyl-2-pyrrolidone (NMP)/GBL casting solutions are investigated. With the increase of membrane thickness, the transition of membrane morphology from sponge-like to finger-like structure occurs at critical structure-transition thickness Lc. Lc and the general sponge-like structure thickness (Lgs) increase with wGBL. For 20 wt.% P84/NMP/GBL casting solution, the membrane morphology changes from finger-like to sponge-like structure at the critical weight ratio of GBL (w⁎ = 0.69). The membrane morphology and performance of hollow fibers spun with various wGBL are observed. Compared with the hollow fiber membranes made of 18 wt.% P84/NMP/GBL dope solution with wGBL = 0.75, the hollow fiber membranes spun with wGBL = 0.25 present a higher permeation flux and a larger MWCO. As wGBL increases from 0.25 to 0.75, the membrane morphology transfers from finger-like to sponge-like structure. An increase in shear rate shifts the rejection curves towards left, and lowers the MWCO of hollow fiber membranes. For hollow fiber membranes spun with wGBL = 0.75, a relatively high permeation flux and a large MWCO are obtained by the wet spinning process. | URI: | https://hdl.handle.net/10356/98627 http://hdl.handle.net/10220/10867 |
ISSN: | 0011-9164 | DOI: | 10.1016/j.desal.2011.10.024 | Rights: | © 2011 Elsevier B.V. | Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | IESE Journal Articles |
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