本計畫目的為瞭解與改善滲透蒸發薄膜於分離過程中擴散控制機制，擬採用不同分子量聚酯系列高分子塑合劑以改善薄膜擴散選擇性與滲透蒸發薄膜之分離性能。本計畫擬摻合以不同分子量之聚酯系列高分子塑合劑於Polysulfone (PSf)，期望以控制高分子塑合劑量與分子大小製備出不同高分子蠕動特性之Polysulfone複合薄膜，尋找出薄膜膨潤後之有效自由體積與擴散分離選擇性之關係。計劃構想中塑合劑之添加可改變薄膜自由體積且改變滲透蒸發之質傳行為，而藉由薄膜吸附與擴散性質分析可瞭解薄膜自由體積與擴散選擇性之關係，研究中將藉由 Tg測試瞭解薄膜中高分子塑合劑改善薄膜自由體積之程度，並探討高分子蠕動特性與滲透蒸發性能之相互關係，且將討論不同水含量下之膨潤特性以瞭解高分子薄膜於滲透蒸發分離過程中可能之擴散機構，且以滲透蒸發操作條件之變化, 如滲透蒸發之進料濃度、溫度變化等,以獲得最佳分離性能, 且將深入探討滲透蒸發操作變化對滲透蒸發性能之影響。 For purpose of improvement separation performance of polysulfone membrane and understanding the mass transport mechanism in pervaporation process. The various molecilar weight of plasticizer additive was used to improve the membrane separation performance. The mobility of plasticizer/PSF membranes was significantly influent the permeate transport behavior in the dense membranes. It was found that the mass transport barrier in membrane was dominated by both of the plasticization effect of permeates and free volume change in blend membranes. The understanding of the above behaviors benefited the modification of pervaporation membranes. In this study, the Tg measurement was used to discuss the free volume change. The swelling properties of those blend membranes were also investigated with various feed concentrations. The effect of operating conditions, such as operating temperature, feed concentration on the separation performance was also discussed in this study.
