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1993 Fiscal Year Final Research Report Summary

Study of Mechanisms of Crystal Growth of Ferroelectric Polymers by Means of Measurement of Nonlinear Dielectric Spectrum

Research Project

Project/Area Number 04650003
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionYAMAGATA UNIVERSITY

Principal Investigator

IKEDA Susumu  YAMAGATA UNIVERSITY, FUCULTY OF ENGINEERING, PROFESSOR, 工学部, 教授 (30007025)

Project Period (FY) 1992 – 1993
KeywordsFerroelectric Polyjers / Nonlinear Properties / Second Order Dielectric Constant / Third Order Dielectric Constant / Electrostriction / Curie Transition
Research Abstract

Qualitative difference of ferroelectric polymers from ferroelectric ceramics is becoming clearer. Specifically, we observed remarkable polymer effects in phenomena such as formation and reversal of polarization, crystal growth, paraelectric-ferroelectric phase transition. Results of this study are summarized as follows.
1) We succeeded in development of a new system to measure exactly and easily nonlinear properties such as electrostriction, second order and third order dielectric constants.
2) We foud tha t a second order dielectric constant reflects a polarization state of crystals and a third order dielectric constant reflects the thermodynamical order of the Curite transision, The origin of piezoelectricity in VDF/TrFE copolymers was elucidated by an evaluation of an electrostriction constant.
A theory of ferroelectric polymers was proposed. We found that the forroelectric properties of polymer crystals are affected by intermolecular interaction and intramolecular one and those competition.
In addition to ferroelectric polymers including VDF, the ferroelectric properties of odd-number nylon were investigated. We found that its ferroelectricity is strongly affected by the hydrogen bonds.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Susumu Ikeda: "Theoretically Reproduced Phase Diagram of Copolymers of VDF and TrFE" Repts.Prog.Polym.Phys.Jpn.36. 137-140 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Susumu Ikeda: "Nonlinear Mechanical Deformation Occurring with Polarization Reversal in Ferroelectric Polymers" Repts.Prog.Polym.Phys.Jpn.36. 309-312 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Susumu Ikeda: "Polarization Reversal Phenomena of Nylon II" Repts.Prog.Polym.Phys.Jpn.35. 361-362 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshinao Sekimura: "Ferroelectric Phase Transition of VDF and TrFE Copolymers" Repts.Prog.Polym.Phys.Jpn.35. 363-365 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Susumu Ikeda: "Correlation between Ferroelectric Phase Transition and Polarization Reversal Phenomena Observed through Nonlinear Dielectric Anomaly in Fluorocopolymers" Polymer Journal. 24. 1223-1227 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡辺知久: "強誘電性高分子フッカビニリデン-トリフルホロエチレン共重合体の電わい現象" 高分子論文集. 49. 585-589 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Susumu Ikeda: "Theoretically Reproduced Phase Diagram of Copolymers of VDF and TrFE" Repts. Prog. Polym. Phys. Jpn.36. 137-140 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Susumu Ikeda: "Nonlinear Mechanical deformation Occurring with Polarization Reversal in Ferroelectric Polymers" Repts. Prog. Polym. Phys. Jpn.36. 309-312 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Susumu Ikeda: "Polarization Reversal Phenomena of Nylon 11" Repts. Prog. Polym. Phys. Jpn.35. 361-362 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshinao Sekimura: "Ferroelectric Phase Transition of VDF and TrFE Copolymers" Repts. Prog. Polym. Phys. Jpn.35. 363-365 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Susumu Ikeda: "Corelation between Ferroelectric Phase Transition and Polarization Reversal Phenomena Observed through Nonlinear Dielectric Anomalyin Ferroelectric Fluoro-copolymers" Polym. J.24-11. 1223-1227 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomohisa Watanabe: "Electrostriction of Ferroelectric Copolymer of Vinylidene Fluoride and Trifluoroethylene" Kobunshi Ronbunshu. 49-7 (in Japanese). (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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