Piezoelectric resonance in uniaxially oriented films of chiral polymers

Author

Nishi, M. ; Kano, K. ; Takahashi, Y. ; Furukawa, T.

Author_Institution

Dept. of Chem., Sci. Univ. of Tokyo, Japan

fYear

1999

fDate

1999

Firstpage

473

Lastpage

476

Abstract

Face-shear mode piezoelectric resonance has been measured in terms of dielectric frequency spectra for uniaxially oriented films of chiral polymers such as poly(lactic acid), poly(y-benzyl glutamate) and cyanoethyl cellulose. Analytical expressions are derived for the length-extensional and width-extensional mode resonance spectra of a 45° cut rectangular sample. Fitting the observed spectra allows estimates of the electromechanical coupling coefficient as well as dielectric and elastic constants as complex quantities. Piezoelectric relaxation spectra associated with the segmental motion are presented

Keywords

crystal resonators; dielectric relaxation; elastic constants; permittivity; piezoelectric thin films; polymer films; 45° cut rectangular sample; analytical expressions; chiral polymers; cyanoethyl cellulose; dielectric constants; dielectric frequency spectra; elastic constants; electrets; electromechanical coupling coefficient; face-shear mode; length-extensional mode resonance spectra; piezoelectric relaxation spectra; piezoelectric resonance; poly(lactic acid); poly(y-benzyl glutamate); segmental motion; uniaxially oriented films; width-extensional mode resonance spectra; Dielectric measurements; Equations; Frequency measurement; Piezoelectric films; Piezoelectricity; Polymer films; Resonance; Strain measurement; Stress; Vibration measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on

Conference_Location

Athens

Print_ISBN

0-7803-5025-1

Type

conf

DOI

10.1109/ISE.1999.832088

Filename

832088