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题名: Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance
作者: Ren, Jizhong1, 2;  Li, Zhansheng2
关键词: Membrane morphology ;  Membrane thickness ;  Hollow fiber membrane ;  Ultrafiltration ;  Pore size distribution
刊名: DESALINATION
发表日期: 2012-01-31
DOI: 10.1016/j.desal.2011.10.024
卷: 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
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.
关键词[WOS]: PHASE-INVERSION PROCESS ;  THICKNESS-GRADIENT MEMBRANES ;  SEPARATION PERFORMANCE ;  SHEAR RATE ;  IMMERSION PRECIPITATION ;  GAS SEPARATION ;  POLYMER ;  SYSTEM ;  SPINNERET ;  RHEOLOGY
语种: 英语
WOS记录号: WOS:000300478100044
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142993
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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