T. Furukawa, K. Kano, Y. Takahashi, K. Nakamura, T. Kanamoto
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High performance polyvinylidene fluoride films prepared by solid-state coextrusion
High performance polyvinylidene fluoride films were successfully obtained by solid-state coextrusion of dry gel films to an extrusion draw ratio of 9. They exhibit square D-E hysteresis loops with remanent polarization 100 mC/m/sup 2/. The electromechanical coupling coefficient determined by thickness extensional mode piezoelectric resonance reaches 0.27. These values are 60% greater than those obtained for conventional uniaxially-drawn PVDF films. The electromechanical data taken over a broad temperature range are presented and the factors that achieve high performance are discussed.
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