高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (6): 1424.

• 研究论文 • 上一篇    下一篇

凝固浴温度对PVDF-g-PNIPAAm温度敏感膜成膜过程与性能影响

冯霞, 郭艳芬, 赵义平, 李建新, 陈熙, 贺晓凌, 陈莉   

  1. 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  300160
  • 收稿日期:2010-06-30 修回日期:2010-12-01 出版日期:2011-06-10 发布日期:2011-05-10
  • 通讯作者: 陈莉 E-mail:tjpuchelis@163.com
  • 基金资助:

    国家自然科学基金(批准号:  20774604)、 天津市高等学校发展基金(批准号:  20071214, 20080305)、 国家“八六三”计划项目(批准号:  2007AA03Z533)和天津市应用基础研究项目(批准号:  10JCZDJC22000)资助.

Influence of Coagulant Temperature on the Membrane Formation Process and Properties of PVDF-g-PNIPAAm Temperature\|sensitive Membranes

FENG Xia, GUO Yan-Fen, ZHAO Yi-Ping, LI Jian-Xin, CHEN Xi, HE Xiao-Ling, CHEN Li*   

  1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Material Science & Engineering, Tianjin Polytechnic University, Tianjin 300160,  China
  • Received:2010-06-30 Revised:2010-12-01 Online:2011-06-10 Published:2011-05-10
  • Contact: CHEN Li E-mail:tjpuchelis@163.com
  • Supported by:

    国家自然科学基金(批准号:  20774604)、 天津市高等学校发展基金(批准号:  20071214, 20080305)、 国家“八六三”计划项目(批准号:  2007AA03Z533)和天津市应用基础研究项目(批准号:  10JCZDJC22000)资助.

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摘要： 通过自由基共聚的方法制备了聚偏氟乙烯-g-聚（N-异丙基丙烯酰胺）（PVDF-g-PNIPAAm）共聚物，进而采用浸没沉淀相转化法制备了PVDF-g-PNIPAAm共聚膜。采用超声时域反射法研究了不同凝固浴温度下PVDF-g-PNIPAAm的成膜动力学。结合PVDF-g-PNIPAAm的成膜动力学，研究了凝固浴温度对膜结构与性能的影响。结果表明，在不同凝固浴温度下，PVDF-g-PNIPAAm的成膜过程均由液液分相来控制，凝固浴温度为30℃时成膜时间最长，40℃时成膜时间最短；不同凝固浴温度下制备的 PVDF-g-PNIPAAm共聚膜保持了PVDF的结晶特性，随着凝固浴温度的升高，结晶度降低。同PVDF-g-PNIPAAm共聚物相比，PNIPAAm在PVDF-g-PNIPAAm膜表面的含量更高，其中，30℃时所成膜表面的PNIPAAm含量最高。不同凝固浴温度下所成的膜均呈指状孔结构，其中，30℃下所成的膜指状孔最大，孔隙率最高。25℃下制备的PVDF-g-PNIPAAm膜具有明显的温度响应性能，其水通量在30℃附近有显著增加。

关键词: 聚偏氟乙烯\, g\, 聚(N\, 异丙基丙烯酰胺), 成膜动力学, 超声时域反射, 膜, 凝固浴温度

Abstract: The copolymer of poly(vinylidene fluoride) grafting poly(N-isopropylacrylamide) (PVDF-g-PNIPAAm) was synthesized and its flat sheet membranes were prepared. The influence of coagulant temperature on membrane formation kinetics was studied by the ultrasonic time-domain reflectometry. Based on the membrane formation kinetics, the influence of coagulant temperature on the structure and performance of PVDF-g-PNIPAAm membrane was studied. The results showed that the coagulant temperature influenced the membrane formation process greatly. The liquid-liquid dimixing dominated the dimixing process at different coagulant temperature. The needed membrane formation time of PVDF-g-PNIPAAm prepared at 30℃ was the longest and that of the membrane prepared at 40℃ was the shortest. The crystal properties of the PVDF-g-PNIPAAm membrane are dominated by the corresponding PVDF structure. The higher the coagulant temperature, the lower the degree of crystallinity is. The NIPAAm content on the surface of PVDF-g-PNIPAAm membrane is much higher than that of the PVDF-g-PNIPAAm copolymer. The NIPAAm content on the surface of PVDF-g-PNIPAAm membrane prepared at 30℃ is the highest. All the membranes presents finger-like pores .The membranes prepared at 30℃ has the largest pores and the highest porosity. The water flux of membrane prepared at 25℃ showed obvious temperature sensitivity and increased intensively at about 30℃.

Key words: PVDF-g-PNIPAAm, membrane formation kinetic, ultrasonic time-domain reflectometry(UTDR), membranes, coagulant temperature

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