高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (11): 2585-2590.doi: 10.7503/cjcu20120033

• 高分子化学 • 上一篇    下一篇

热致相分离法制备乙烯-三氟氯乙烯共聚物微孔膜

周波, 林亚凯, 马文中, 唐元晖, 田野, 王晓琳   

  1. 清华大学膜材料与工程北京市重点实验室, 北京 100084
  • 收稿日期:2012-01-09 出版日期:2012-11-10 发布日期:2012-10-15
  • 通讯作者: 王晓琳,男,博士,教授,博士生导师,主要从事膜分离技术.E-mail:xl-wang@tsinghua.edu.cn E-mail:xl-wang@tsinghua.edu.cn
  • 基金资助:

    国家"九七三"计划项目(批准号: 2009CB623401); 国家"八六三"计划项目(批准号: 2009AA062901, 2012AA03A604)和北京市自然科学基金重大项目(批准号: 2100001)资助.

Preparation of Ethylene Chlorotrifluoroethylene Co-polymer Membranes via Thermally Induced Phase Separation

ZHOU Bo, LIN Ya-Kai, MA Wen-Zhong, TANG Yuan-Hui, TIAN Ye, WANG Xiao-Lin   

  1. Beijing Key Laboratory of Membrane Materials and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2012-01-09 Online:2012-11-10 Published:2012-10-15

摘要:

通过热致相分离法制备了乙烯-三氟氯乙烯共聚物(ECTFE)微孔膜, 考察了ECTFE与不同溶剂的相互作用参数对ECTFE/溶剂体系的液液相区的影响, 通过相容性分析及对ECTFE微孔膜断面结构的观察, 筛选出能与ECTFE发生明显液液相分离的溶剂--邻苯二甲酸二乙酯(DEP). 热力学相图证明, ECTFE/DEP体系具有较宽的液液相分离区, 偏晶点所对应的ECTFE质量分数高达55%. 考察了冷却条件对\{ECTFE/DEP体系膜断面结构的影响, 结果表明, 膜断面孔径随着淬冷温度的降低而减小, 在淬冷温度为458 K时膜断面孔径随粗化时间的增加而增大.

关键词: 热致相分离法, 微孔膜, 乙烯-三氟氯乙烯共聚物, 邻苯二甲酸二乙酯

Abstract:

Microporous ethylene chlorotrifluoroethylene co-polymer(ECTFE) membrane was prepared via thermally induced phase separation(TIPS) method. By an analysis of interaction parameter, compatibility of ECTFE/diluent systems and the membrane cross-section morphologies, the liquid-liquid phase separation was found during the TIPS process when diethyl phthalate(DEP) was chosen as a diluent. The thermodynamic phase diagram confirms that a large liquid-liquid phase separation region for the ECTFE/DEP system was observed. The monotectic point of this system appeared at a high polymer concentration which was approximately up to 55%. Moreover, the effects of the cooling temperature and coarsening time on membrane structure, porosity, and tensile strength were also investigated. The results showed that a faster cooling rate and shorter coarsening time at 458 K led to membranes with smaller pore size.

Key words: Thermally induced phase separation, Ethylene chlorotrifluoroethylene co-polymer, Microporous membrane, Diethyl phthalate

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