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Crystal Transformation, Piezoelectricity, and Ferroelectric Polarization Reversal in Poly(Vinylidene Fluoride)

  • Kasumi Matsushige
  • Tetuo Takemura
Part of the Polymer Science and Technology book series

Abstract

The mechanisms for the II-I crystal transformation in poly(vinyl-idene fluoride) (PVDF) by various procedures were studied with a PSPC (position sensitive proportional counter) X-ray system. Simultaneous X-ray and stress-strain relationship measurements during a drawing procedure revealed that the crystal transformation from Form II to Form I always initiates at the deformation stage where a necking was completed at the center of tensile samples, thus suggesting that a heterogeneous stress distribution in the sample plays a critically important role. High pressure X-ray experiments on a heating process exhibited that this polymer transforms from Form II to folded-chain Form I and then extended-chain Form I crystals before melting. The II-I crystal transformation was also observed to proceed with an activation energy of 30 kcal/mol on an annealing procedure at 4000 kg/cm2. Furthermore, a uniaxial compressional deformation and a drawing at high pressures were observed to cause this II-I crystal transformation. These phenomena were utilized to prepare the Form I samples with a high degree of crystal perfection and to improve considerably their piezoelectric properties. Finally, ferroelectric polarization switching experiments were carried out for Form I crystal films in wide ranges of temperature and pressure. The switching current behavior at atmospheric pressure changed remarkably at about −50°C which coincides well with the reported glass transition temperature.

Keywords

Piezoelectric Property Vinylidene Fluoride Polarization Switching Amorphous Part Ferroelectric Polarization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Kasumi Matsushige
    • 1
  • Tetuo Takemura
    • 1
  1. 1.Department of Applied Science, Faculty of EngineeringKyushu UniversityHakozaki, Higashi-ku, Fukuoka, 812Japan

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