Simultaneous, Synergistic Control of Ion Exchange Capacity and Cross-Linking of Sterically-Protected Poly(benzimidazolium)s
| Autor: | Thomas Weissbach, Alireza Sadeghi Alavijeh, Timothy J. Peckham, Steven Holdcroft, Vivian Pan, Andrew G. Wright, Erik Kjeang |
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| Rok vydání: | 2016 |
| Předmět: |
Steric effects
chemistry.chemical_classification Materials science Ion exchange General Chemical Engineering Cationic polymerization 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Membrane Chemical engineering chemistry Polymer chemistry Materials Chemistry medicine Swelling medicine.symptom 0210 nano-technology Dissolution Ionomer |
| Zdroj: | Chemistry of Materials. 28:8060-8070 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.6b03902 |
| Popis: | The application of highly charged anion exchange membranes is often limited by strong water sorption leading to excessive swelling and eventual dissolution, especially at elevated temperatures. The cross-linking of polymers has been shown to be an excellent mitigation strategy but this often restricts membrane and ionomer processing methods. Here, we explore the reaction, stability, and utility of a cross-linking agent for the recently discovered class of cationic polymers: methylated, C2-protected poly(benzimidazolium)s. In situ reaction and formation of p-xylyl cross-linking groups is found to provide novel, highly functionalized, hydroxide-stable membranes and films with enhanced anion conductivities and superior mechanical properties compared to un-cross-linked polymers. The versatility of this strategy will be important in the design of polymers for the preparation of stable, hydroxide-conducting films, membranes, and ionomers. |
| Databáze: | OpenAIRE |
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