The electric moment contribution to the piezoelectricity of PVDF

Author

Schaffner, F. ; Jungnickel, B.-J.

Author_Institution

Deutsches Kunststoff-Inst., Darmstadt, Germany

Volume

1

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

553

Lastpage

562

Abstract

Basically the piezoelectric constant is composed of two contributions, i.e. of mechanical load-induced changes of the sample electric moment at fixed sample shape (`moment term´) and of mechanical load induced changes of the sample shape at fixed sample electric moment (`shape term´). In the present paper, the contribution of the material´s permittivity to the moment terms of the hydrostatic piezoelectric coefficients of unoriented polarized PVDF/PMMA blends are calculated and compared with the experimental values. It must be concluded from the results that the polarized domains behave as elongated particles which are oriented parallel to the polarization direction although the supermolecular structure is isotropic. Several possible origins of this observation are presented and discussed

Keywords

dielectric polarisation; electric moments; permittivity; piezoelectric materials; piezoelectricity; polymer blends; PVDF; electric moment contribution; elongated particles; hydrostatic piezoelectric coefficients; mechanical load-induced changes; piezoelectric constant; piezoelectricity; polarization direction; polarized domains; supermolecular structure; unoriented polarized PVDF/PMMA blends; Amorphous materials; Corona; Crystallization; Dielectrics; Ferroelectric materials; Piezoelectric polarization; Piezoelectricity; Shape; Stress; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.311697

Filename

311697