Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 32, Pages 8762-8769Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02561d
Keywords
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Funding
- Department of Energy Office of Basic Energy Sciences [DE-SC0016390]
- MRSEC Program of the National Science Foundation [DMR-1720256 (IRG-2)]
- National Science Foundation [1650114]
- Holbrook Foundation Fellowship through the UCSB Institute for Energy Efficiency
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Polymeric ionic liquids (i.e., PILs) are single ion-conducting materials that exhibit the thermal and electrochemical stability of ionic liquids and the mechanical properties of polymers. Although PILs are exciting for a variety of applications in energy conversion and storage, the tradeoff between mechanics and ion transport remains an important limitation in materials design. Herein, a photocrosslinkable PIL based on the cycloaddition reaction of anthracene is converted from a viscous liquid into a soft solid without detrimental effects on the bulk ionic conductivity. The independent control of mechanical- and ion-conducting properties results from negligible changes in polymer segmental dynamics (i.e., glass transition temperature) upon crosslinking. This was demonstrated for both a polymer (i.e., N = 279) and its corresponding oligomer (i.e., N = 10). The ease of processability facilitated by the presented molecular design is illustrated by both patterning the PIL into m-sized features, and incorporating it as a dielectric in thin-film transistors for low-voltage operation independent of device fabrication geometry.
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