新型聚乙烯醇/硅系杂化膜的制备及渗透性能  

Preparation and permeation characteristics of novel PVA/APTEOS hybrid membranes

作　　者：张秋根[1] 陈瑜[1] 陈建华[1] 刘庆林[1] 

机构地区：[1]厦门大学化学化工学院化学工程与生物工程系,福建厦门361005

出　　处：《化工学报》2007年第5期1238-1243,共6页CIESC Journal

基　　金：国家自然科学基金项目(50573063);高等学校博士点专项基金(20050384013)~~

摘　　要：采用溶胶-凝胶法制备了聚乙烯醇(PVA)/γ-氨丙基三乙氧基硅氧烷(APTEOS)有机/无机杂化膜。用FTIR和XRD对杂化膜进行了表征。测定了膜在乙醇/水溶液中的溶胀行为。考察了杂化膜对85%(质量)的乙醇/水溶液的渗透蒸发分离性能。加入APTEOS降低了PVA的结晶度,有效控制了膜的溶胀,呈现出优良的分离性能。随着APTEOS含量的增加,杂化膜的选择性急剧增加,在5.0%(质量)时达到最大值;同时膜的渗透通量迅速增加。解决了PVA膜trade-off效应。Novel organic-inorganic hybrid membranes were prepared through sol-gel reaction of poly （vinyl alcohol） （PVA） with γ-aminopropyl-triethoxysilane （APTEOS）. The resulting membranes were characterized with Fourier transform infrared spectroscopy and wide-angle X-ray diffraction. The swelling degree of PVA and PVA/APTEOS hybrid membranes in water/ethanol mixture was determined. The pervaporation performance was investigated by separation of water/ethanol mixture at 50℃. The effect of APTEOS content on the pervaporation performance was studied. The decrease in swelling degree with increasing APTEOS content was due to the formation of hydrogen and covalent bonds in the membrane matrix. The crystalline region of PVA decreased with increasing APTEOS content. The separation factor for water increased, and then decreased when APTEOS content was more than 5.0% （mass）. The hybrid membrane containing 5.0% （mass） APTEOS exhibited the highest separation factor. However the permeation rate increased remarkably with increasing APTEOS content. The trade-off relation of the PVA membrane was solved, and the PVA/APTEOS hybrid membranes showed high pervaporation properties.

关 键 词：聚乙烯醇 渗透蒸发 有机-无机杂化膜 γ-氨丙基三乙氧基硅氧烷 

分 类 号：O623.611[理学—有机化学]