The Dependence of the Piezoelectric Response of Poly(Vinylidene Fluoride) on Phase I Volume Fraction.
Abstract
Since the initial discovery of the large piezoelectric response of poled, oriented films of poly(vinylidene fluoride) (PVF2) by Kawai, several subsequent studies have attempted to elucidate the mechanisms responsible for this phenomenon. Since the greatest piezoelectric activity (by at least a factor of 3) is found for poly(vinylidene fluoride) films with the phase I crystal structure, any satisfactory explanation of the effect must account for this feature. Mechanisms most often discussed are: a bulk polarization of the sample due to field induced reorientation or switching of the molecular dipoles in the polar, phase I crystals; non-uniform charge injection leading to an asymmetric distribution of real charge in the sample; a field induced charge-trapping of injected charge or ionic charges present as impurities; some type of surface phenomenon caused by the strong interaction between the positive electrode and the film during poling.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA067961
Entities
People
- B. A. Newman
- J. I. Scheinbeim
- K. D. Pae
- K. T. Chung
Organizations
- Rutgers University–New Brunswick