Title :
Nonlinear piezoelectricity in oriented films of PVDF and its copolymers
Author :
Date, M. ; Fukuda, Eisuke ; Wendorff, J.H.
Author_Institution :
Inst. of Phys. & Chem. Res., Saitama, Japan
fDate :
6/1/1989 12:00:00 AM
Abstract :
The nonlinear Piezoelectric constant for the stretched and poled films of polyvinylidene fluoride (PVDF) and (75/25) copolymer of vinylidene fluoride and trifluoroethylene has been determined by measuring the second harmonic component of polarization under sinusoidal stress. The constant increased above the glass transition temperature. A simple interpretation for the mechanism of nonlinear piezoelectricity is presented assuming the residual polarization is decreased by applying the tension perpendicular to the molecular chain axis
Keywords :
dielectric polarisation; glass transition (polymers); piezoelectric materials; polymer blends; polymer films; glass transition temperature; nonlinear Piezoelectric constant; oriented films; polarization; poled films; polyvinylidene fluoride trifluoroethylene copolymer; residual polarization; second harmonic component; sinusoidal stress; Chemicals; Frequency; Helium; Nonlinear equations; Piezoelectric films; Piezoelectric polarization; Piezoelectricity; Residual stresses; Stress measurement; Temperature dependence;
Journal_Title :
Electrical Insulation, IEEE Transactions on
