热致相分离法制备乙烯-三氟氯乙烯共聚物微孔膜  

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

作　　者：周波[1] 林亚凯[1] 马文中[1] 唐元晖[1] 田野[1] 王晓琳[1] 

机构地区：[1]清华大学膜材料与工程北京市重点实验室,北京100084

出　　处：《高等学校化学学报》2012年第11期2585-2590,共6页Chemical Journal of Chinese Universities

基　　金：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);北京市自然科学基金重大项目(批准号:2100001)资助

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.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.

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 

分 类 号：O631.1[理学—高分子化学]