膜科学与技术

PTFE-PDMS/PET复合膜制备及其渗透汽化性能

作者：孙德¹，² 李冰冰² 许振良¹

单位： 1华东理工大学化学工程联合国家重点实验室，化学工程研究所膜科学与工程研发中心, 上海 200237；2长春工业大学化学工程学院，长春 130012

关键词：聚四氟乙烯（PTFE）; 聚二甲基硅氧烷（PDMS）; 渗透汽化；乙醇/水溶液

出版年,卷(期):页码： 2013,33(3):39-43

摘要：

以聚四氟乙烯(PTFE)微粉填充聚二甲基硅氧烷（PDMS）硅橡胶膜为活性皮层和PET无纺布为底膜，制备了PTFE-PDMS/PET渗透汽化复合膜并用于分离乙醇水溶液，分析了复合膜结构、疏水性、力学性能及溶胀性能。研究表明，随着PDMS复合膜中PTFE含量增加，复合膜结晶度及水接触角增加；断裂伸长率和拉伸强度均呈现先增加后减小的趋势；膜溶胀度呈线性减少。复合膜渗透汽化选择性?和乙醇渗透系数JE随PTFE含量的增加先增加后减少，而水渗透系数JW呈逐渐减小的趋势，当PTFE填充量为10 wt.%时，乙醇渗透系数JE最大。

A novel composite membrane using micron polytetrafluoroetene (PTFE) powder filled polydimethylsiloxane (PDMS) as the top active layer and polyethylene terephthalate (PET) non-woven fabric as the support layer was prepared for the pervaporation of ethanol from water. The crystal structure, mechanical prosperities and swelling degree of composite membranes were characterized. With the increase of the PTFE content, the crystallinity of composite membrane increased but the swelling degree decreased. The elongation at break and the tensile stress of the PTFE ?lled PDMS membrane first increased and then decreased. The separation selectivity(?)and ethanol permeance (JE)increased quickly to the maximum then decreased slowly but water permeance(Jw) decreased with the increasing of PTFE content in filled PDMS membranes. When the content of the PTFE additive in PDMS composite membrane is 10wt. %, the ethanol permeance is the best.

孙德（1973-），男，博士研究生，副教授。主要从事膜分离技术研究。E-mail:sunde2002@126.com；通讯作者：许振良，电话:021-64252989；E-mail：chemxuzl@ecust.edu.cn。

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