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2019 IEEE International Symposium on Applications of Ferroelectrics (ISAF), 2019
We investigate the crystal properties dependence of the dielectric and ferroelectric performance of pure polyvinylidene fluoride (PVDF) films with various molecular weights using large-scale stretching of 5-time. After stretching, all PVDF films show the crystalline transition from well-defined α and β crystal grains to all trans crystal slice rather ...
Weimin Xia +3 more
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We investigate the crystal properties dependence of the dielectric and ferroelectric performance of pure polyvinylidene fluoride (PVDF) films with various molecular weights using large-scale stretching of 5-time. After stretching, all PVDF films show the crystalline transition from well-defined α and β crystal grains to all trans crystal slice rather ...
Weimin Xia +3 more
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Pyroelectricity in polyvinylidene fluoride
Journal of Applied Physics, 1973The pyroelectric behavior of as-received 2-mil polyvinylidene fluoride films was studied as a function of the poling treatment. It is shown that poling induces a thermally reversible electric polarization in addition to an electric polarization which vanishes upon the first heating of the sample.
G. Pfister, M. Abkowitz, R. G. Crystal
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Characterization of Polyvinylidene Fluoride.
1979Abstract : An apparatus for measuring the electrical properties of polymer films is described. The dielectric and pyroelectric properties of commercial and radiation polymerized polyvinylidene fluoride are compared. (Author)
J. M. Bates +3 more
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Pyroelectricity in polyvinylidene fluoride
Journal of Applied Physics, 1979The magnitude of the pyroelectric coefficient in polyvinylidene fluoride was observed to increase significantly on maintaining the poling field while cooling the samples from elevated poling temperatures to ambient temperature. The results of the measurement of the depolarization currents with repeated thermal cycling of poled specimens from ...
D. K. Das-Gupta, J. S. Duffy
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Dipole reorientation in polyvinylidene fluoride
Journal of Applied Physics, 1974The thermally stimulated current (TSC) from polarized polyvinylidene fluoride is studied below room temperature. The experimental results indicate that the maximum of the TSC observed at ∼ −50°C is due to reorientation of dipoles in a process associated with the glass transition. The TSC peak is inhomogeneously broadened by a distribution in relaxation
G. Pfister, M. A. Abkowitz
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Piezoelectric relaxation in polyvinylidene fluoride
Journal of Applied Physics, 1979The piezoelectric and related properties have been measured for stretched polyvinylidene fluoride as a function of temperature. The piezoelectric relaxation observed around the glass transition temperature Tg is discussed taking the two-phase structure into consideration.
T. Furukawa, J. Aiba, E. Fukada
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FeCl3 doped polyvinylidene fluoride
Journal of Materials Science, 1994Infrared (350-4000 cm -1) and optical (1.1 5 x 1 04 - 2.95 x 1 04 cm -1) spectra, differential thermal analysis (DTA) and d.c. electrical resistivity of FeCI3- doped polyvinylidene fluoride (PVDF) films, over the doping mass fraction range 0 ~< w ~< 0.40, have been measured. The i.r. spectra provided evidence of: (a) the presence of both ~ and y phases
A. Tawansi +3 more
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On the flexoelectricity in Polyvinylidene fluoride films
MRS Proceedings, 2012ABSTRACTIt is well known that there is a linear electro-mechanical coupling under equilibrium thermodynamics in certain crystalline materials with non-centrosymmetric structures. Since Kogan and Meyer published their seminal papers in 1960s[1, 2], people have gradually realized that an inhomogeneous electro-mechanical coupling also exists in insulating
Xiangtong He +2 more
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Piezoelectricity and ferroelectricity in polyvinylidene fluoride
Ultrasonics, 1981Abstract The dielectric, elastic and electrostrictive constants of polyvinylidene fluoride (pvdf) are influenced by thermal molecular motion, particularly at the glass transition temperature. High temperature poling is caused by both dipolar orientation and space-charge redistribution.
E. Fukada, T. Furukawa
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Ferroelectric behavior of polyvinylidene fluoride
Ferroelectrics, 1981Abstract The hysteresis loops between the electric displacement and the triangular applied electric field with an amplitude up to 300 MV/m and a period of 1000 sec were observed at -5°C and -80°C for stretched films of PVDF with form I crystalline phase.
T. Takahashi, M. Date, E. Fukada
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