凝胶浴温度对PVDF膜的对称结构及晶型的调控  

Controlling the Morphology and Crystal Form of Symmetric Network PVDF Membranes by Bath Temperature

作　　者：叶茜[1] 邢力[1] 张林[1] 陈欢林[1] 

机构地区：[1]浙江大学化学工程和生物工程学系,浙江杭州310027

出　　处：《高分子材料科学与工程》2011年第9期84-87,共4页Polymer Materials Science & Engineering

基　　金：国家973计划项目(2009CB623402);中央高校基本科研业务费专项资金资助项目

摘　　要：以聚偏氟乙烯(PVDF)为膜材料,通过浸没沉淀法制备得到开放性网络状对称结构的PVDF膜。分别考察不同凝固浴温度对膜结构和晶型的影响。结果表明,当温度较高时,溶剂与非溶剂的扩散传质速度也较快,有利于形成α晶型的PVDF晶体。温度较低时,成膜较慢,PVDF大分子在极性的凝胶浴中有足够的时间由非极性的α晶型扭转形成极性的β晶型。而β晶型的PVDF由于H、F均匀分布在碳链的两侧,分子呈极性,更有利于蛋白质的吸附。当磷酸三乙酯(TEP)凝胶浴温度为20℃,纯水凝胶浴温度为8℃时,所制备的膜以β晶型为主,蛋白吸附量高达160μg/cm2。Symmetric network poly（vinylidene fluoride）（PVDF） membranes without dense skin layer were prepared by immersion precipitation in the PVDF/ triethyl phosphate（TEP） system.The effect of coagulation bath temperature on the morphology and crystallization of PVDF membranes was investigated.At higher temperatures,the diffusional mass transfer between the solvent and the non-solvent was enhanced,causing the formation of α-type PVDF crystallites.Thus,PVDF membranes with crystallites that are predominantly β-type could be obtained at lower temperature.The β-type PVDF crystal was polar due to it all-trans arrangement.The interaction of hydrogen bonding or electrostatic force between β-type and bovine serum albumin（BSA） may be stronger than that with α-type.M20-8（TEP coagulation bath 20 ℃,water coagulation bath 8 ℃） can absorb BSA up to 160 μg/cm2.

关 键 词：聚偏氟乙烯 膜 Β晶型 凝固浴温度 蛋白吸附 

分 类 号：TB383[一般工业技术—材料科学与工程]