Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 14, Pages 8727-8730Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b01220
Keywords
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Funding
- ONR [N000141612082, N000141612459]
- U.S. Department of Defense (DOD) [N000141612082, N000141612459] Funding Source: U.S. Department of Defense (DOD)
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Significantly enhanced electromechanical responses are inherent to piezoelectric materials at the morphotropic phase boundary (MPB). Here we reveal that conformational competition between the trans-planar and 3/1-helical phases of poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) occurs intramolecularly rather than intermolecularly to induce the formation of MPB. We attribute significantly enhanced piezoelectric properties observed near MPB to the polarization rotation between energetically degenerate trans-planar and 3/1-helical phases. Our results offer design principles to search for new MPB polymers from a molecular perspective.
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