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Insights into the Morphotropic Phase Boundary in Ferroelectric Polymers from the Molecular Perspective
- Liu, Yang, Zhang, Bing, Haibibu, Aziguli, Xu, Wenhan, Han, Zhubing, Lu, Wenchang, Bernholc, J., Wang, Qing
- Journal of physical chemistry 2019 v.123 no.14 pp. 8727-8730
- electrical properties, molecular conformation, polymers
- 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.