膜科学与技术

纺丝过程中拉伸比对七通道聚砜中空纤维膜微结构及性能的影响

作者：张洁敏，赵宝宝，徐天成，李诗文，付振刚，李建新

单位：天津工业大学材料科学与工程学院中空纤维膜材料与膜过程省部共建国家重点实验室培育基地，天津，300387

关键词：七通道中空纤维膜；聚砜；拉伸比；溶液相转化法

出版年,卷(期):页码： 2014,34(6):6-10

摘要：

以聚砜（PSf）为膜材料、N,N-二甲基乙酰胺（DMAc）为溶剂、聚乙二醇（PEG）为添加剂配成纺丝铸膜液，通过溶液相转化制备七通道聚砜中空纤维膜，系统研究了不同拉伸比对膜形态结构及性能的影响规律。结果表明：纤维外径、小孔直径及小孔与小孔之间的距离以及内表面功能层厚度等均随着拉伸比的提高而减小。同时，提高了其中空纤维膜的纯水通量由96.5 L/(m2·h)增加到131.8 L/(m2·h)；但对BSA的截留率有所降低，断裂伸长率及断裂强度也均有一定程度的减小也有所降低.

Polysulfone(PSf) as a fundamental membrane material，N, N-dimethy lacetamide ( DMAc) as a solvent and polyethylene glycol(PEG) as an additive were used to prepare seven-bore polysulfone hollow fiber membranes via immersion phase precipitation. The effects of draw ratio on the morphologies and performances of PSf hollow fiber membranes were investigated. The results show that the outer diameter of the hollow fiber membrane, the inner diameter of the small bores, the distance between the small bores and the thickness of the dense layer of the small bores decreased with the increase of draw ratio. Meanwhile, the pure water permeation flux increased from 96.5 L/(m2·h) to 131.7 L/(m2·h) with the increase of draw ratio. Besides, BSA rejection, the breaking force and the elongation of the hollow fiber membranes decreased with the increase of draw ratio.

张洁敏(1989-)，女，山东青州市人，硕士研究生，主要从事中空纤维膜制备。

参考文献：

[1] Ghosh S, Bhattacharya P, Majumdar S, et al. Comparative study on treatment of kitchen-sink wastewater using single and multichannel ceramic membrane[J]. International Journal of Environmental Technology and Management, 2010, 13(3): 336～347.
[2] Gille D, Czolkoss W. Ultrafiltration with multi-bore membranes as seawater pre-treatment[J]. Desalination, 2005, 182(1): 301～307.
[3] Kesting R E, Fritzsche A K. Polymeric gas separation membranes[M]. New York: Wiley, 1993.
[4] Liu Y, Koops G H, Strathmann H. Characterization of morphology controlled polyethersulfone hollow fiber membranes by the addition of polyethylene glycol to the dope and bore liquid solution[J]. Journal of membrane science, 2003, 223(1): 187～199.
[5] Ren J Z, Chung T S, Li D, et al. Development of asymmetric 6FDA-2, 6 DAT hollow fiber membranes for CO2/CH 4 separation: 1. The influence of dope composition and rheology on membrane morphology and separation performance[J]. Journal of membrane science, 2002, 207(2): 227～240.
[6] Kim J H, Min B R, Won J, et al. Phase behavior and mechanism of membrane formation for polyimide/DMSO/water system[J]. Journal of Membrane Science, 2001, 187(1): 47～55.
[7] Lin K Y, Wang D M, Lai J Y. Nonsolvent-induced gelation and its effect on membrane morphology[J]. Macromolecules, 2002, 35(17): 6697～6706.
[8] Tsai H A, Li L D, Lee K R, et al. Effect of surfactant addition on the morphology and pervaporation performance of asymmetric polysulfone membranes[J]. Journal of Membrane Science, 2000, 176(1): 97～103.
[9] Nakajima T, Kajiwara K, McIntyre JE. Advanced fiber spinning technology[M]. Woodhead Pub Limited, 1994, (Chapter 2).
[10] Wangxi Z, Jie L, Gang W. Evolution of structure and properties of PAN precursors during their conversion to carbon fibers[J]. Carbon, 2003, 41(14): 2805～2812.
[11] Wang K Y, Fei Li D, Chung T S, et al. The observation of elongation dependent macrovoid evolution in single-and dual-layer asymmetric hollow fiber membranes[J]. Chemical engineering science, 2004, 59(21): 4657～4660.
[12] Chou W L, Yang M C. Effect of take-up speed on physical properties and permeation performance of cellulose acetate hollow fibers[J]. Journal of membrane science, 2005, 250(1): 259～267.
[13] Yu D G, Chou W L, Yang M C. Effect of draw ratio and coagulant composition on polyacrylonitrile hollow fiber membranes[J]. Separation and purification technology, 2006, 52(2): 380～387.
[14] 徐天成,张洁敏,付振刚等.聚合物多通道中空纤维膜研究进展. [J] .膜科学与技术,2013,33(5).
[15] 陈颖,李雪梅,李晓明.聚丙烯中空纤维膜拉伸性能测试方法试验研究. [J] .膜科学与技术,2010,30(4):65～68.
[16] Heijnen M, Winkler R, Berg P. Optimisation of the geometry of a polymeric Multibore® ultrafiltration membrane and its operational advantages over standard single bore fibres[J]. Desalination and Water Treatment, 2012, 42(1-3): 24～29.
[17] [16] Cao C, Chung T S, Chen S B, et al. The study of elongation and shear rates in spinning process and its effect on gas separation performance of poly (ether sulfone)(PES) hollow fiber membranes[J]. Chemical engineering science, 2004, 59(5): 1053～1062.

服务与反馈：

【文章下载】【加入收藏】

《膜科学与技术》编辑部地址：北京市朝阳区北三环东路19号蓝星大厦邮政编码：100029 电话：010-64426130/64433466 传真：010-80485372邮箱：mkxyjs@163.com