本研究計畫之構想為利用孔隙性高分子或無機陶瓷膜為基材，披覆高親水性奈米複合皮層，製備出高通透量及高選擇性之滲透蒸發分離膜應用於有機溶劑之去水，並初步探討高親水性複合應用於海水淡化膜、除鹽奈米過濾膜、抗阻塞為過濾膜之製備與應用之可性。構想中選用成膜性優異之polysulfone高分子基材作為基材並製備成MF、UF、NF等級之支撐膜，預計以濕式成膜技術調控製造具非對稱性結構及孔隙性皮層高基材薄膜，無機膜管則採用配合廠商(虹盺特殊陶瓷有限公司)提供之精密陶瓷膜為基材。計畫中高分子支撐膜成膜過程中由於溶劑及沉澱劑交換速率調控形成所需求支撐材孔隙，極親水性高分子皮層考量採用(poly(2-hydroxy- ethyl-methacrylate) (PHEMA)、polyacryl acid( PAA)或 polydopamine(PDA)等親水性高分子，並嘗試加入奈米材料(ZnO、TiO2、SiO2, 由力煒奈米材料科技股份有限公司提供) 形成含奈米物質之塗佈溶液後進行親水皮層製備，塗佈方式則以浸漬法(dip coating)、或噴霧塗佈法(spray coating)方式形成次微米皮層，皮層親水特性之調整藉由奈米材料及高分子成份調整，親水皮層之製備亦考量以濕式成膜技術控制皮層之厚度與孔隙性。預計皮層塗佈奈米複合鑄膜液之厚度為0.5-2微米，如鑄膜液濃度為6-12 wt%，則藉由浸塗或噴塗之方式製備親水層，預計親水性表面皮層成膜後皮層厚度約為30nm - 240nm，計畫中另一需克服之工作為進行奈米材之均勻分散，由於本計畫添加奈米材料為金屬氧化物，將考量不同種類奈米分散劑之配比以達到均勻奈米分散之目的(力煒奈米材料科技股份有限公司協助)。 This project is proposed to prepare a higher performance pervaporation membrane with super hydrophilic skin layer which is supported on polymeric or ceramic porous substrate. The prepared hydrophilic composite membranes will be applied for dehydration of organic solvent solution and they also considered applying for desalination, reverse osmosis, ultrafiltration applications. In this investigation, polysulfone will be used as the substrate polymer due to its good membrane formation properties. Utilizing wet phase inversion method, the porosity of polysulfone membrane will be controlled by adjusting the phase inversion rate of polymer in the membrane formation process. The porous MF, UF, and NF polysulfone membranes will be prepared as the support for preparation of nanocomposite membranes. The ceramic substrate of nanocomposite membrane will be supplied by the commercial product (supplied by Hon shin Co.). The superhydrophilic skin layer will be prepared by using (poly(2-hydroxy-ethyl-methacrylate) (PHEMA)、polyacryl acid( PAA), and polydopamine(PDA) as the hydrophilic polymer and nano particle additive ( supplied by Liwei Nano Tech. Co. Ltd) will be used as hydrophilic enhancer for skin layer formation. The skin layer will be made by dipped method or spray method with casting solution layer thickness 0.5-2μm in 6-12 wt% polymer solution with nanoparticle additive. It is expected that the thickness of extra thin skin layer will be in the range of 20-240 nm with defect free surface. The expected difficult of this investigation is homogeneity of nanoparticle (metal oxides) in the casting polymeric solution. The dispersion enhancer (supplied by Liwei Nano Tech. Co. Ltd.) will be considered additive in the polymeric solution to improve the membrane formation and nano particle dispersion in the polymer.
