Membrane Science and Technology

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Preparation of polyvinylidene fluoride hollow fiber porous membrane via a low thermally induced phase separation

Authors： LU Zhiping, LU Xiaolong *,WU Chunrui ,JA Yue,WANG Xuan,CHEN Huayan,GAO Qijun

Units： State Key Laboratory of Hollow Fiber Membrane Materails and Membrane Process ,Institute of Biology and Chemistry Engineering,Tianjin Polytechnic University,Tianjin 300160,China

KeyWords： polyvinylidene fluoride; hollow fiber membrane;thermally induced phase separation;membrane structure

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2012, 32(1):12-17

Abstract：

In this paper, a low thermally induced phase separation (L-TIPS) method was proposed.Polyvinylidene fluoride (PVDF) hollow fiber porous membranes were prepared by dry-wet spinning technology.The effect of competition of membrane preparing mechanism between a nonsolvent induced phase separation (NIPS) and a thermally induced phase separation (TIPS) on the morphology structure and performance of the membranes were researched.The result showed that,TIPS and NIPS occurred simultaneously in the process of L-TIPS,compared with membrane prepared by NIPS, membrane prepared by L-TIPS had no macro-void and presented a few small finger-like pores,globusity structure in the middle and skin layers in the inside and outside surfaces,so this sructure strengthened the antipollution performance and strength of the membrane;The effect of TIPS was more evidence and the effect of NIPS was weaker if the difference between cloud point of spinning dope and coagulation temperature became bigger and membrane thickness became thicker,the result were that the pure water flux and strength of the membrane were all improved,the rejection of egg albumin had no evidence change;The spinning dope tempreture of L-TIPS was lower than spinning dope tempreture of traditional TIPS,so frenquently-used hydrophilic polymeric additives （PVP、PEG、PVA） could add to the spinning dope.

Funds：

863课题工业循环冷却水膜集成净化过程研究（2008AA06Z303）；天津市重点基金课题废水浓缩减排与淡化再利用技术研究（09JCZDJC26300）

AuthorIntro：

逯志平，女（1984-），山东菏泽人，硕士研究生，主要从事PVDF中空纤维膜的制备研究，E-mail: zhili25@163.com；,通讯联系人，吕晓龙(1964-)，教授，主要从事中空纤维膜材料与膜过程研究，E-mail: luxiaolong@263.net

Reference：

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