Radiation-grafted proton exchange membranes based on co-grafting from binary monomer mixtures into poly(ethylene-co-tetrafluoroethylene) (ETFE) film |
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| Authors: | Joon-Yong Sohn Hae-Jun Sung Joo-Myung Song Junhwa Shin Young-Chang Nho |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. National & Local Joint Engineering Research Center for Precision Thermalforming Technology of Advanced Metal Materials, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;1. Surface Engineering Group, Manchester Metropolitan University, Manchester M1 5GD, UK;2. Bobst Manchester Ltd., Pilsworth Road, Heywood, Lancashire OL10 2TL, UK;3. Department of Materials, University of Oxford, Begbroke Science Park, Oxford OX5 1PF, UK;4. Innovia Films Ltd., Lowther R&D Building, West Road, Wigton, Cumbria CA7 9XX, UK |
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| Abstract: | In this study, proton exchange membranes (PEMs) based on a poly(ethylene-co-tetrafluoroethylene) (ETFE) film were synthesized through the graft copolymerization of styrene and VTMS (vinyltrimethoxysilane), or styrene and TMSPM (3-(trimethoxysilyl) propyl methacrylate) binary monomer systems using a simultaneous irradiation method. The prepared membranes with the similar degrees of grafting were investigated by measuring ion exchange capacity, proton conductivity, water uptake, chemical stability, and dimensional stability. The results indicate that the silane-crosslinked proton exchange membrane (PEM) has not only lower water uptake and dimensional change but also high proton conductivity at low humidity condition compared to non-crosslinked poly(ethylene-co-tetrafluoroethylene)-g-poly(styrene sulfonic acid) (ETFE-g-PSSA). Also, the chemical stability of silane-crosslinked fuel cell membranes was more improved than that of non-crosslinked fuel cell membrane. |
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