混合稀释剂对热致相分离法制备聚偏氟乙烯微孔膜结构的影响  

Effets of mixed diluents on micrographs of polyvinylidene fluorid microporous membrane via thermally induced phase separation

作　　者：刘振[1] 张珊[1] 黄永福[1] 李会军[1] 

机构地区：[1]天津工业大学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

出　　处：《功能材料》2011年第6期1112-1114,1118,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA030304);天津市科技支撑计划资助项目(09ZCKFSH02300)

摘　　要：以邻苯二甲酸二甲酯(DMP)/邻苯二甲酸二辛酯(DOP)为混合稀释剂,采用热致相分离法(TIPS)制备聚偏氟乙烯(PVDF)微孔膜。研究了聚合物浓度、降温速率、混合稀释剂配比和凝固浴温度对聚偏氟乙烯微孔膜结构的影响。结果表明,随聚合物浓度的增加,膜断面由树枝状结构过渡为球粒状结构,最终转变为致密结构;随降温速率的增加,膜中的晶粒尺寸减小,数量增多;随混合稀释剂中DMP含量的增加,膜中的球晶结构更加完善;随凝固浴温度的增加,膜中的球粒状结构减少,花边状结构增加,微孔膜断面的平整度和孔径均匀性增强。Polyvinylidene fluorid（PVDF） microporous membranes were prepared via thermally induced phase separation（TIPS） process with the mixed diluents of dimethyl phthalate（DMP） and dioctyl phthalate（DOP）.The effects of polymer concentration,cooling rate,ratio of mixed diluents and coagulation bath temperature on the membrane micrographs were investigated.The experimental results showed that microporous membrane morphologies were transited from branch structure to spherulite,and finally changed to compact structure with the polymer concentration increased.The crystalline grain size decreased and the amount of crystalline grain increased with the cooling rate increased.The microporous membrane spherulite was changed perfect with DBP＇s weight ratio of mixed diluents increased.As coagulation bath temperature increased,the microporous membrane spherulite decreased and lace structure increased,the smooth and pore sizes uniform of membrane increased.

关 键 词：热致相分离 混合稀释剂 聚偏氟乙烯 微孔膜 

分 类 号：TQ028.8[化学工程]