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Acrylamide plasma-induced polymerization onto expanded poly(tetrafluoroethylene) membrane for aqueous alcohol mixture vapor permeation separation |
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| Authors: | Chen-Yuan Tu Yi-Chieh Wang Hui-An Tsai Juin-Yih Lai |
| Institution: | a R&D Center for Membr. Technol. and Department of Chemical Engineering, Chung Yuan University, Chung Li 32023, Taiwan b Department of Chemical Engineering, Nanya Institute of Technology, Chung Li 32034, Taiwan c Department of Textile Engineering, Nanya Institute of Technology, Chung Li 32034, Taiwan |
| Abstract: | To improve the vapor permeation performance of aqueous alcohol mixtures, acrylamide (AAm) plasma activation then post-graft polymerization onto an expanded poly(tetrafluoroethylene) (e-PTFE) membrane, e-PTFE-g-AAm, was synthesized in this study. The surface properties of the e-PTFE-g-AAm membrane were characterized using ATR/FTIR, SEM, AFM and the water surface contact angle. The degree of grafting increases with increasing polymerization temperature. A maximum value was obtained at 80 °C. The water contact angle of the pristine e-PTFE membrane and the e-PTFE-g-AAm membrane with a 21% grafting degree was 109.7° and 34.1°, respectively. Optimum vapor permeation performance was obtained using an e-PTFE-g-AAm membrane with a 21% grafting degree for a 90 wt.% aqueous ethanol solution, giving a permeate water concentration of 99.4% and a permeation rate of 648 g/m2 h. |
| Keywords: | Plasma Expanded poly(tetrafluoroethylene) Post-graft polymerization Vapor permeation |
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