Gas-phase and liquid-phase pre-irradiation grafting of AAc onto LDPE and HDPE films for pervaporation membranes |
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| Institution: | 1. Radiation Chemistry Laboratory, Chinese Institute of Atomic Energy, P.O. Box 275, No. 86, Beijing, People''s Republic of China;2. Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment, 1233 Watanuki-machi, Takasaki 370-12, Japan;1. Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran;2. Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran;3. Water Research Institute, Tehran, Iran;1. Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran;2. Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran;1. Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran;2. Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran;3. Faculty of Polymer Engineering, Sahand University of Technology, Tabriz, Iran;1. School of Civil Engineering, Tianjin University, Tianjin 300350, China;2. Key Laboratory of Coast Civil Structure Safety of the Ministry of Education, Tianjin University Tianjin 300350, China;3. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China;2. Chongqing Terui New Energy Material Co., Ltd, China |
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| Abstract: | A study has been made on gas-phase and liquid-phase pre-irradiation grafting of acrylic acid onto LDPE and HDPE films for pervaporation membranes of ethanol-water mixtures. It was found that the degree of grafting, percent volume change of grafted membranes and length of grafting chains depend on the methods of grafting, crystal state of substrate films and diffusion rate of the monomer in the films. The pervaporation characteristics of grafted membranes is influenced directly by the surface hydrophilicity of grafted membranes, temperature of the feed, degree of grafting, crosslinking of grafted chains and alkaline metal ions in the functional groups. The potassium ion exchange membrane of HDPE synthesized by gas-phase grafting has better pervaporation efficiency. At 80 wt% ethanol in the feed, 25°C feed temperature and 70% degree of grafting a grafted membrane has a 0.65 kg/m2h flux and a separation factor of 20. |
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