The hydrostatic piezoelectric coefficient of PVDF/PMMA blends

Author

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

Author_Institution

Deutsches Kunststoff-Inst., Darmstadt, Germany

Volume

26

Issue

1

fYear

1991

fDate

2/1/1991 12:00:00 AM

Firstpage

78

Lastpage

84

Abstract

The piezoelectric coefficients of polyvinylidenefluoride (PVDF) are known to be strictly dependent on the strength of the applied load. For hydrostatic piezoelectricity, it is shown that this nonlinearity is mainly due to the pressure dependence of the bulk compressibility and that blending with polymethyl methacrylate (PMMA) causes a change of sign of the intrinsic electric moment contribution to the overall piezoelectricity. PMMA molecules deteriorate the orientation correlation between the PVDF electric moments in the interface between the amorphous and crystalline phases, and this activity is enhanced by compression. The theoretical background of piezoelectric coefficients is reviewed, and the sample materials, high-pressure investigations, and X-ray and infrared measurements are discussed

Keywords

X-ray diffraction examination of materials; dielectric polarisation; piezoelectric materials; piezoelectric thin films; polymer blends; polymer films; 0 to 260 MPa; PVDF/PMMA blends; X-ray measurements; blending with PMMA; blending with polymethyl methacrylate; bulk compressibility; change of sign; copolymers; electric dipoles; electric moments; high-pressure investigations; hydrostatic piezoelectric coefficient; hydrostatic piezoelectricity; infrared measurements; intrinsic electric moment; nonlinearity; polyvinylidenefluoride; pressure dependence; theoretical background; Amorphous materials; Crystallization; Frequency; Glass; Helium; Piezoelectric materials; Piezoelectric polarization; Piezoelectricity; Temperature dependence; Tensile stress;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.68231

Filename

68231