Results 201 to 210 of about 1,113,748 (251)

Relaxor ferroelectric polymers

ISAF 1998. Proceedings of the Eleventh IEEE International Symposium on Applications of Ferroelectrics (Cat. No.98CH36245), 2002
An exceptionally high electrostrictive response was observed in electron irradiated polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) copolymer. Moreover, the transverse strain of the material can be tuned over a large range by different sample treatment conditions.
Q.M. Zhang, V. Bharti, Z.-Y. Cheng, null Xing-Zhong Zhao   +3 more
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Ferroelectric polarization in polymers

Ferroelectrics, 1980
Abstract Previous work has shown that a model of oriented dipoles accounts quite well for observed piezoelectric and pyroelectric behavior of amorphous and semicrystalline polymers. The process whereby the dipoles become oriented is the subject of this paper.
M. G. Broadhurst, G. T. Davis
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Curie Transitions for Attograms of Ferroelectric Polymers

Nano Letters, 2013
Polymer systems having one, two, or three dimensions on the nanometer length scale can exhibit physical properties different from the bulk. The degree of disorder characteristic for large amounts of matter is strongly reduced and changes in symmetry are imposed by means of geometrical confinement.
Serghei, Anatoli, Zhao, W., Miranda, D., Russell, T.P.   +3 more
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Ferroelectric polymers and their applications

Ferroelectrics, 1982
The piezoelectric and pyroelectric polymer poly(vinylidene fluoride) (PVF2) was recently classified as a polymeric ferroelectric. The physical properties of PVF2 are reviewed to justify this definition. Applications are classified on the basis of transduction mechanism including electrical to mechanical, mechanical to electrical, thermal to mechanical,
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Ferroelectric polymers and applications

Ferroelectrics, 1984
AbstractThis paper reviews the general features of ferroelectricity in polyvinylidene fluoride and related polymers; ferroelectricity is shown as the origin of piezoelectricity, pyroelectricity and high dielectric permittivity. Preparation technologies are discussed, and applications are presented, with special attention to capacitor dielectrics and ...
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Piezoelectric relaxation in ferroelectrics and polymers

Ferroelectrics, 1982
Abstract Until recently a fairly large number of studies have been reported on piezoelectric relaxations in polymers. The relaxational behaviors are often complicated, reflecting the composite structure of polymeric materials. On the other hand, studies of piezoelectric dispersions in hard crystals are very scarce, because usually the dispersion occurs
Katsumi Hamano, Toshihisa Yamaguchi
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Polarization Reversal of Ferroelectric Polymers

Japanese Journal of Applied Physics, 1985
Two kinds of effects of the depolarization field in a ferroelectric crystallite of the polymer on its polarization reversal switching are discussed. Space charges on the crystallite-amorphous phase interface reduce the depolarization field, decelerating the polarization reversal.
Susumu Ikeda, Tomohiro Fukada, Masashi Jimbo, Kiyohito Koyama, Yasaku Wada   +4 more
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Recent advances in ferroelectric polymers

Macromolecular Symposia, 1995
AbstractIn the Polymer Electroprocessing Laboratory at Rutgers University, we have discovered that the odd‐numbered nylons constitute the second known class of ferroelectric polymers1–3, and that polarized films exhibit piezoelectric properties similar to poly(vinylidene fluoride) (PVF2) and copolymers of PVF2 and trifluoroethylene (PVF2/PVF3). A study
J. I. Scheinbeim, B. A. Newman
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Morphology and structure of polymer electrets and ferroelectric polymers

IEEE Transactions on Electrical Insulation, 1993
The author considers how the heterogeneous microstructure of semicrystalline polymers used in electret applications can influence the mechanisms of charge trapping and charge transport. The crystallization of polymer chains is described, and the control of the semicrystalline morphology is discussed.
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Ferroelectric polymers and ir detection

Ferroelectrics, 1995
Abstract Thomson-CSF/LCR and TCS have carried out research in the field of IR sensors working at room temperature using ferroelectric and pyroelectric copolymers of poly(vinylidene fluoride) and trifluo-roethylene. The copolymers are soluble and easy to process by the standard technique of CCD silicon circuits. This paper describes the realization of a
Jean Claude Dubois, Philippe Robin
openaire   +1 more source