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Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance
Ren, Jizhong1,2; Li, Zhansheng2
关键词Membrane Morphology Membrane Thickness Hollow Fiber Membrane Ultrafiltration Pore Size Distribution
刊名DESALINATION
2012-01-31
DOI10.1016/j.desal.2011.10.024
285页:336-344
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Technology ; Physical Sciences
类目[WOS]Engineering, Chemical ; Water Resources
研究领域[WOS]Engineering ; Water Resources
关键词[WOS]PHASE-INVERSION PROCESS ; THICKNESS-GRADIENT MEMBRANES ; SEPARATION PERFORMANCE ; SHEAR RATE ; IMMERSION PRECIPITATION ; GAS SEPARATION ; POLYMER ; SYSTEM ; SPINNERET ; RHEOLOGY
英文摘要In this paper, the effects of gamma-butyrolactone (GBL) weight ratio (w(GBL)) 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 L-c. L-c and the general sponge-like structure thickness (L-gs) increase with w(GBL). 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 w(GBL) are observed. Compared with the hollow fiber membranes made of 18 wt.% P84/NMP/GBL dope solution with w(GBL) = 0.75, the hollow fiber membranes spun with w(GBL) = 0.25 present a higher permeation flux and a larger MWCO. As w(GBL) 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 w(GBL) = 0.75, a relatively high permeation flux and a large MWCO are obtained by the wet spinning process. (C) 2011 Elsevier BM. All rights reserved.
语种英语
WOS记录号WOS:000300478100044
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/142993
专题中国科学院大连化学物理研究所
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Natl Engn Res Ctr Membrane Technol, Dalian 116023, Peoples R China
2.Nanyang Technol Univ, Inst Environm Sci & Engn, Singapore 637723, Singapore
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GB/T 7714
Ren, Jizhong,Li, Zhansheng. Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance[J]. DESALINATION,2012,285:336-344.
APA Ren, Jizhong,&Li, Zhansheng.(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.
MLA Ren, Jizhong,et al."Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance".DESALINATION 285(2012):336-344.
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