DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click
HERE to register or log in.
Accession Number:
ADA067961
Title:
The Dependence of the Piezoelectric Response of Poly(Vinylidene Fluoride) on Phase I Volume Fraction.
Corporate Author:
RUTGERS - THE STATE UNIV PISCATAWAY NJ
Report Date:
1979-04-01
Abstract:
Since the initial discovery of the large piezoelectric response of poled, oriented films of polyvinylidene 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 polyvinylidene 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.
Descriptive Note:
Technical rept.,
Pages:
0025
Contract Number:
N00014-75-C-0540
File Size:
8.46MB
