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题名: Effects of the thermodynamics and rheology of BTDA-TDI/MDI co-polyimide (P84) dope solutions on the performance and morphology of hollow fiber UF membranes
作者: Ren, Jizhong1, 2;  Li, Zhansheng2;  Wang, Rong2
关键词: hollow fiber preparation ;  thermodynamics ;  rheology ;  pore size distribution
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2008-02-15
DOI: 10.1016/j.memsci.2007.10.026
卷: 309, 期:1-2, 页:196-208
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: In this work, hollow fiber UF membranes were prepared using BTDA-TDI/MDI co-polyimide (P84, synthesized by the condensation of 2,4-diisocyanato-1-methyl benzene and 1-1'-methylenebis[4-isocyanatobenzene] with 5-5'-carbonylbis[1,3-isobenzofurandione])/N-methyl-2pyrrolidone (NMP)/acetone/H2O/LiCl/polyoxyethylenesorbitan monooleate (Tween80) dope solutions with two approaching ratios (alpha=0, 0.2). The effects of the thermodynamic characteristic (described with the approaching ratio a) of the dope solution, the theological property (described with shear rate) of the dope solution within the spinneret and other spinning conditions such as air gap, the volume ratio of the dope solution to the bore fluid (c)) on the structure, morphology and performance of P84 hollow fiber membranes were studied. The hollow fiber membranes spun with the approaching ratio alpha=0.2 was found to have a high permeation flux and a large molecular weight cut-off (MWCO) due to the existence of water in the dope solution compared with those spun with the approaching ratio a=0. The performance of the hollow fiber membranes was dominated by the shear rate of the dope solution within the spinneret according to shear induced molecular orientation. With an increase in shear rate, a low permeation flux and a small MWCO were achieved, and the pore size distribution curve of the membrane shifted to the left, indicating the membrane exhibited a good selectivity. The transition of the spinning process from the wet spinning to the dry-jet wet spinning strongly influenced the performance of the hollow fiber membranes, and a relative low permeation flux and a small MWCO could be obtained when the air gap was not less than 1 cm. With a decrease in the volume ratio of the dope solution to the bore fluid (c)), the membrane thickness became thinner, resulting in the increase of permeation flux and the MWCO. (C) 2007 Elsevier B.V. All rights reserved.
关键词[WOS]: GAS SEPARATION PERFORMANCE ;  SHEAR RATE ;  ULTRAFILTRATION MEMBRANES ;  IMMERSION PRECIPITATION ;  SPINNING CONDITIONS ;  PHASE-SEPARATION ;  SOLVENT ;  SYSTEM ;  NONSOLVENT ;  POLYMER
语种: 英语
WOS记录号: WOS:000252813000023
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140994
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.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,Wang, Rong. Effects of the thermodynamics and rheology of BTDA-TDI/MDI co-polyimide (P84) dope solutions on the performance and morphology of hollow fiber UF membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2008,309(1-2):196-208.
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