Title :
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
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;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832088
