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.

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