Paraelectric Crystalline Polymers for High Energy Density and Low Loss Dielectrics

ORAL

Abstract

It is known that the high temperature phase above the Curie temperature (Tc) in poly(vinylidene fluoride-\textit{co}-trifluoroethylene) [P(VDF-TrFE)] is a typical paraelectric phase. Frequency-dependent electric displacement-electric field (D-E) loop tests are used to study the dielectric/ferroelectric properties of this paraelectric phase. It is observed that normal ferroelectric hysteresis loops are observed at a poling frequency of 1 Hz, while narrow paraelectric loops are observed at a high poling frequency of 1000 Hz. The poling mechanism is revealed by an in-situ electric field-dependent Fourier transform infrared study. From this study, we consider that paraelectric crystalline polymers are good candidates for high energy density and low loss dielectrics.

*Financial supports: Chinese Scholarship Council, National Science Foundation (DMR-0907580), and Army Research Office (W911NF-11-1-0534).

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Authors

  • Lei Zhu

    • Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
    • Case Western Reserve University

  • Run Su

    • College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065

  • Jung-Kai Tseng

    • Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202

  • Mao-Sheng Lu

    • Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202