ポリふっ化ビニリデンの電わい効果と圧電性

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タイトル別名
  • Electrostriction and Piezoelectric Effects in Poly (vinylidene fluoride)
  • ポリフッカ ビニリデン ノ デンワイ ヒズミ コウカ ト アツデンセイ

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抄録

The electrostriction and the piezoelectric constants were measured for uniaxially stretched and rolled poly (vinylidene fluoride) films. In order to control amorphous orientations, the techniques of thermal shrinkage were employed for the uniaxially stretched films. The electrostriction constant of thermally shrunk samples is in proportion to the degree of amorphous orientation. Analysis of infrared dichroism revealed that the dichroic ratio, which is ascribed to amorphous region at 600cm-1, changed with the applied strain; it increased with the increase of draw ratio. The draw ratio dependences of the dichroism change are very similar to those of the electrostriction constant. Further, the theoretical expression of the electrostriction effect, derived from the orientation model of the amorphous chains, is in good agreement with experiment. Consequently, the positive electrostriction effect stems mainly from the change of the amorphous orientation with the applied strain. It is clarified that the contributions of the electrostriction effect to the piezoelectricity of highly oriented PVDF films are up to 50%.

収録刊行物

  • 高分子論文集

    高分子論文集 36 (10), 689-695, 1979

    公益社団法人 高分子学会

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