热致相分离法制备乙烯三氟氯乙烯共聚物微孔膜——混合溶剂的选择  

ECTFE membranes prepared viathermally induced phase separation——selection of mixed diluent

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

机构地区：[1]清华大学化学工程系膜材料与工程北京市重点实验室,北京100084

出　　处：《膜科学与技术》2013年第1期27-32,43,共7页Membrane Science and Technology

基　　金：国家重点基础研究发展计划项目(973计划;2009CB623401);国家高技术研究发展计划资助项目(863计划;2009AA062901;2012AA03A604);北京市自然科学基金重大项目(2100001)

摘　　要：研究了混合溶剂对热致相分离法制备乙烯三氟氯乙烯共聚物(ECTFE)微孔膜的影响,考察了不同非溶剂对ECTFE/癸二酸二丁酯(DBS)体系结晶趋势的影响.通过相容性分析及ECTFE微孔膜断面结构的观察,非溶剂亚磷酸三苯酯(TPP)的加入能使ECTFE/DBS体系从固液相分离转变为液液相分离.当非溶剂与溶剂的质量比比例(TPP∶DBS)为4∶6时,可制得孔径均匀的双连续结构ECTFE微孔膜.此比例下的热力学相图显示,ECTFE/DBS/TPP三组分体系具有较宽的液液相分离区,该体系偏晶点所对应的ECTFE质量分数高达50%.Influence of mixed diluents on ethylene chlorotrifluoroethylene co-polymer （ECTFE） microporous membrane prepared via thermally induced phase separation （TIPS） was studied. The effect of different nonsolvents on crystallization of ECTFE/dibutyl sebacate （DBS）/nonsolvent systems was investigated. Based on the analysis of the compatibility of ECTFE/DBS/nonsolvent systems and the cross- section morphologies of membrane, it was found that the phase separation of the ECTFE/DBS system was changed from solid-liqiud to liquid-liquid when triphenyl phosphite （TPP） was added. A bicontinuous ECTFE membrane structure with uniform pore size was obtained at the ratio of TPP ： DBS=4 ： 6. The thermodynamic phase diagram of ECTFE/DBS/TPP system showed a large liquid-liquid phase separation region and a monotectic point at the polymer concentration as high as 50%.

关 键 词：热致相分离法 微孔膜 乙烯-三氟氯乙烯共聚物 混合溶剂 

分 类 号：TB383.2[一般工业技术—材料科学与工程]