Yu Chung-Hao, Kusumawardhana Irdham, Lai Juin-Yih, Liu Ying-Ling
R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, #200, Chung-Pei Road, Chungli, Taoyuan 32023, Taiwan.
J Colloid Interface Sci. 2009 Aug 1;336(1):260-7. doi: 10.1016/j.jcis.2009.03.052. Epub 2009 Apr 5.
Plasma polymerization of ethylene diamine (EDA) on PTFE film surfaces is applied to modify PTFE surfaces to become hydrophilic and to incorporate amino groups onto PTFE surfaces. The surface-modified PTFE films are utilized as substrates for interfacial polymerization of EDA and trimesoyl chloride to prepare PTFE/polyamide thin-film composite (TFC) membranes. The effect of plasma power for plasma polymerization on the morphology and performances of the PTFE/PA TFC membranes are examined and discussed. The presence of amino groups on the PTFE substrates provides chemical linkages between PTFE and PA layers in interfacial polymerization to make the PTFE/PA TFC membranes are stable for pervaporation separations. A high permeation flux of 1910 g/hm(2) and a separation factor of 290 are observed with the PTFE/PA TFC membranes for pervaporation dehydration on a 70 wt% isopropanol aqueous solution at 70 degrees C. This approach explores a new method to prepare PTFE-based TFC membranes via interfacial polymerizations. The prepared TFC membranes could be potentially utilized in pervaporation and nanofiltration separations.
在聚四氟乙烯（PTFE）薄膜表面进行乙二胺（EDA）的等离子体聚合，以将PTFE表面改性为亲水性并在PTFE表面引入氨基。表面改性的PTFE薄膜用作EDA和均苯三甲酰氯界面聚合的基材，以制备PTFE/聚酰胺薄膜复合（TFC）膜。研究并讨论了等离子体聚合的等离子体功率对PTFE/PA TFC膜的形态和性能的影响。PTFE基材上氨基的存在为界面聚合中PTFE和PA层之间提供了化学连接，使PTFE/PA TFC膜在渗透蒸发分离中稳定。在70℃下对70 wt%异丙醇水溶液进行渗透蒸发脱水时，PTFE/PA TFC膜的渗透通量高达1910 g/hm²，分离因子为290。该方法探索了一种通过界面聚合制备PTFE基TFC膜的新方法。制备的TFC膜可潜在地用于渗透蒸发和纳滤分离。
