Results 151 to 160 of about 217,212 (206)

Dipole reorientation in polyvinylidene fluoride

Journal of Applied Physics, 1974
The 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, 1979
The 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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On the flexoelectricity in Polyvinylidene fluoride films

MRS Proceedings, 2012
ABSTRACTIt 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, Sivapalan Baskaran, John Y. Fu   +2 more
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FeCl3-doped polyvinylidene fluoride

Journal of Materials Science, 1994
Infrared (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, H. I. Abdel-Kader, M. El-Zalabany, E. M. Abdel-Razek   +3 more
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On the origin of pyroelectricity in polyvinylidene fluoride

Journal of Applied Physics, 1978
In order to determine the relative contribution of primary pyroelectricity and secondary pyroelectricity to the total pyroelectric coefficient of polyvinylidene fluoride, samples have been heated suddenly using a 200-ps laser pulse and the time dependence of the appearance of the pyroelectric charge measured.
R. G. Kepler, R. A. Anderson
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Piezoelectricity and ferroelectricity in polyvinylidene fluoride

Ultrasonics, 1981
Abstract 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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Relaxational behaviour of polyvinylidene fluoride

Il Nuovo Cimento B Series 11, 1976
The relaxational behaviour of polyvinylidene fluoride (PVF2) has been characterized by static and dynamic mechanical measurements, carried out in the temperature region between 90 K and 420 K at frequencies of about 1 Hz and 1 kHz. Combination of these mechanical data with dielectric literature data and our own results on thermally stimulated ...
A. Callens, R. De Batist, L. Eersels
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Ferroelectric behavior of polyvinylidene fluoride

Ferroelectrics, 1981
Abstract 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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Properties of polyvinylidene fluoride

2015
This chapter gives a brief account on preparation and processing methods of polyvinylidene fluoride. It is a commonly used fluoroplastic. Important properties of polyvinylidene fluoride are also given.
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Continuous Flow Synthesis of Polyvinylidene Fluoride

ACS Macro Letters
Driven by surging demand in battery technologies, the global production of polyvinylidene fluoride (PVDF) urgently requires scalable and efficient synthesis methods. Current batch processes are constrained by mass and heat transfer limitations, causing scalability and efficiency bottlenecks.
Stefan Herrmann, Nick Semrau, Matthias Wessling   +2 more
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