title: PTFE/polyamide thin-film composite membranes using PTFE films modified with ethylene diamine polymer and interfacial polymerization: preparation and pervaporation application.
abstract: 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.
authors.affiliation: R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, #200, Chung-Pei Road, Chungli, Taoyuan 32023, Taiwan.
authors.forename: Chung-Hao
authors.initials: CH
authors.lastname: Yu
authors.forename: Irdham
authors.initials: I
authors.lastname: Kusumawardhana
authors.forename: Juin-Yih
authors.initials: JY
authors.lastname: Lai
authors.forename: Ying-Ling
authors.initials: YL
authors.lastname: Liu