Reduction of Dielectric Hysteresis in Multilayered Film via Nanoconfinement

POSTER

Abstract

Micro-/nano-layer coextrusion was used to fabricate polycarbonate (PC)/poly(vinylidene fluoride) (PVDF) layered films with significantly reduced dielectric losses while maintaining high energy density. The high-field polarization hysteresis was characterized for layered films as a function of PVDF layer thickness (6000 to 10 nm) and composition (10 to 70 vol.{\%} PVDF), and was found to decrease with decreasing layer thickness and PVDF content. To gain a mechanistic understanding of the layer thickness (or nanoconfinement) effect, wide angle X-ray diffraction, polarized Fourier transform infrared spectroscopy, and broadband dielectric spectroscopy were employed. The results revealed that charge migration, instead of dipole flipping, was responsible for the hysteresis in multilayered films.

*Financial support: National Science Foundation through the Center for Layered Polymeric Systems (CLiPS) Science and Technology Center (DMR-0423914) and the Office of Naval Research (N00014-10-1-0349)

Authors

  • Lei Zhu

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

  • Mathew Mackey

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

  • Donald Schuele

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

  • Lionel Flandin

    • LEPMI, UMR 5279, CNRS, Universit\'e de Savoie, F-73376 Le Bourget Du Lac Cedex, France

  • Mason Wolak

    • US Naval Research Laboratory, Washington, DC 20375, USA

  • James Shirk

    • US Naval Research Laboratory, Washington, DC 20375, USA

  • Anne Hiltner

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

  • Eric Baer

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