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凝固浴组成对热诱导相分离法制备PVDF微孔膜形态结构的影响

作者：王旭东¹，张凯¹，王磊¹，黄丹曦¹，吕永涛¹，孟晓荣²，付小康¹

单位： 1.西安建筑科技大学环境与市政工程学院，陕西西安，710055；

关键词：聚偏氟乙烯；混合稀释剂；热致相分离法；非溶剂致相分离法；形态结构

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2015,35(5):51-57

摘要：

以二乙二醇单乙醚醋酸酯（DCAC）和磷酸三乙酯（TEP）的混合溶剂为稀释剂，采用热诱导相分离法制备PVDF平板微孔膜，获得了不同形态结构的膜。借助SEM、DSC、XRD等技术手段考察了凝固浴组成对PVDF微孔膜形态结构的影响。结果表明：在低温凝固浴（0oC）中形成的膜均表现出颗粒状镶嵌晶体结构的断面。随着DMAC含量的增加，膜断面厚度增大，膜表面皮层厚度减小。膜的上表面形态主要取决于凝固浴组成，随着凝固浴中DMAC含量的增加，上表面由致密变得多孔。膜的结晶特性分析表明，所有的膜PVDF主要结晶成α-相晶体结构，随着凝固浴中DMAC含量的增加，膜的结晶度降低，并伴生有γ-相晶体结构。此外，随着凝固浴中DMAC含量的增加，膜的平均孔径和孔隙率增大，但拉伸强度降低。

The polyvinylidene fluoride ( PVDF) flat membrane was prepared via thermally induced phase separation method using diluent mixtures oftriethylphosphate（TEP）and diethylene glycol monoethyl ether acetate（DCAC），membranes with different structures and morphology are obtained. The effects of coagulation baths on the structures and morphology of PVDF membrane were investigated with SEM，DSC，XRD and other technologies. The result shown that all membrane precipitated from different coagulation baths at low temperature of 0oC were showed granular mosaic crystal structure of the cross-section. With increasing of DMAC content in baths，the cross-section thickness of membrane increases，but the surface layer thickness of membrane decreases. The different coagulation baths strongly influenced the top surface of the membranes.With increasing of DMAC content in coagulation baths，the top surface of membrane by the density become porous.The analysis of membrane crystallization characteristics indicates that all of the membrane PVDF main crystal into alpha phase，with increasing of DMAC content in the coagulation bath，the crystallinity of membrane is decreased，andassociated with gamma phase crystal formation. In addition，by increasing the DMAC content in the coagulation bath，membrane average pore diameter and porosity increases，but the membrane strength decreases.

基金项目：

陕西省科技统筹创新工程计划项目（2012KTCL03-06，2013KTCL03-16）；陕西省科技新星项目（2014KJXX-65）

作者简介：

王旭东（1979~），男，博士，副教授，主要研究方向为膜法水处理技术

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