Facile self-crosslinking to improve mechanical and durability of polynorbornene for alkaline anion exchange membranes |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China;2. School of Civil Engineering and Architecture, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China;3. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, China;1. College of Materials Science and Engineering, North University of China, Taiyuan, 030051 China;2. School of Science, North University of China, Taiyuan, 030051 China;3. National Demonstration Center for Experimental Chemical Engineering Comprehensive Education, School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China;4. INET, Tsinghua University, Beijing, 100084, China;5. Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA;6. Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, USA;7. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;8. Materials Engineering and Nanosensor [MEAN] Laboratory, Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA;1. College of Chemical Engineering, Changchun University of Technology, Changchun 130012, China;2. Advanced Institute of Materials Science Changchun University of Technology, Changchun 130012, China;1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, PR China;2. Department of Energy, Environmental and Chemical Engineering, School of Engineering and Applied Sciences, Washington University in St. Louis, USA;1. College of Materials Science and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, China;2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China |
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| Abstract: | Crosslinking is a valid approach to enhance the mechanical and durability performance of anion exchange membranes (AEMs). Herein, a facile and effective self-crosslinking strategy, with no need for an additional crosslinker or a catalyzer, is proposed. A series of tunable self-crosslinking and ion conduction polynorbornene membranes are designed. The 5-norbornene-2-methylene glycidyl ether (NB-MGE) component which affords self-crosslinking enhances dimensional stability, while the flexible 5-norbornene-2-alkoxy-1-hexyl-3-methyl imidazolium chloride (NB-O-Im+Cl?) hydrophilic unit contributes high conductivity. The crosslinking significantly decreases the water uptake, and water swelling ratio provides excellent solvent-resistance and enhances the thermal and mechanical properties. Additionally, crosslinked rPNB-O-Im-x AEMs exhibit desirable alkaline stability. Impressively, the rPNB-O-Im-30 (IEC = 1.377) shows a moderate ion conductivity (61.8 m S cm?1, 80 °C), with a suppressed water absorption and 88.17% initial OH? conductivity is maintained after treated for 240 h with a 1.0 M NaOH solution at 60 °C. Suitably assessed of rPNB-O-Im-30 AEM reveals a 98.4 mW cm?2 peak power density reached at a current density of about 208 mA cm?2. The report offers a facile and effectual preparative technique for preparing dimensional and alkaline stable AEMs for fuel cells applications. |
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| Keywords: | Self-crosslinking Dimensional stable Durability Polynorbornene Anion exchange membranes Fuel cell |
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