Results 291 to 300 of about 62,079 (347)
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MRS Proceedings, 2005
ABSTRACTThe science and technology of piezoelectric polymers has long been dominated by ferroelectric polymers from the polyvinylidene fluoride (PVDF) family. The piezoelectricity in this polymer class arises from the strong molecular dipoles within the polymer chain and from the resulting change of the dipole density upon application of a mechanical ...
Siegfried Bauer +10 more
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ABSTRACTThe science and technology of piezoelectric polymers has long been dominated by ferroelectric polymers from the polyvinylidene fluoride (PVDF) family. The piezoelectricity in this polymer class arises from the strong molecular dipoles within the polymer chain and from the resulting change of the dipole density upon application of a mechanical ...
Siegfried Bauer +10 more
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Piezoelectric polymer electrets
IEEE Transactions on Dielectrics and Electrical Insulation, 1996In this review the physical properties, mechanisms and models are reviewed which explain the high piezoelectricity of the ferroelectric polymers of the polyvinylidene fluoride (PVDF) family, the odd nylons, the vinylidene cyanide (VDCN) copolymers and polyurea.
G. Eberle, H. Schmidt, W. Eisenmenger
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IEEE Engineering in Medicine and Biology Magazine, 1989
Polymers with piezoelectric and pyroelectric properties that make them useful for biomedical applications and devices are considered. The characteristics of such polymers are examined, and transducers made from them are discussed. Laboratory developments of devices using piezoelectric polymers are briefly reviewed, and the slowness of product ...
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Polymers with piezoelectric and pyroelectric properties that make them useful for biomedical applications and devices are considered. The characteristics of such polymers are examined, and transducers made from them are discussed. Laboratory developments of devices using piezoelectric polymers are briefly reviewed, and the slowness of product ...
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Piezoelectric Polymer Transducers
Advances in Dental Research, 1987Poly(vinylidene fluoride) (CH2-CF2)n is a tough, flexible polymer readily available in the form of thin film which can be made piezoelectric by the temporary application of a high electric field. The areas of the film which become piezoelectric can be controlled to be the areas where metal electrodes are evaporated onto the film.
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Microscopic Models of Piezoelectric Polymers
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1986Modele pour prevoir les coefficients piezoelectrique et pyroelectrique de polyfluorure de ...
B A, Capron, D W, Hess
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Piezoelectric Nanoparticle–Polymer Composite Foams
ACS Applied Materials & Interfaces, 2014Piezoelectric polymer composite foams are synthesized using different sugar-templating strategies. By incorporating sugar grains directly into polydimethylsiloxane mixtures containing barium titanate nanoparticles and carbon nanotubes, followed by removal of the sugar after polymer curing, highly compliant materials with excellent piezoelectric ...
William R, McCall +4 more
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SPICE model for lossy piezoelectric polymers
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2009This work presents the transmission line equivalent model for lossy piezoelectric polymers and its SPICE implementation. The model includes the mechanical/viscoelastic, dielectric/electrical, and piezoelectric/electromechanical losses in a novel way by using complex elastic, dielectric, and piezoelectric constants obtained from the measured impedances ...
DAHIYA R, VALLE, MAURIZIO, LORENZELLI L.
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Piezoelectric polymer hydrophone
The Journal of the Acoustical Society of America, 1983A piezoelectric polymer hydrophone including a single flexible sheet of a ezoelectric polymer having a plurality of electrode strips on the top and bottom of the sheet. The electrode strips at the top are staggered by one half the width of a strip relative to the corresponding strips at the bottom of the sheet.
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Piezoelectricity of polymer films
The Journal of the Acoustical Society of America, 1978Origins of piezoelectricity of polymer films are classified into three: (a) internal strain, (b) strain dependence of spontaneous polarization, and (c) embedded charges coupled with mechanical and/or dielectric heterogeneity. Recent work on piezoelectricity of the polyvinylidene fluoride electret, which arises from mechanism (b) and/or (c), is briefly ...
Y. Wada, R. Hayakawa, K. Namiki
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Piezoelectric SbSI: Polymer composites
Ferroelectrics, 1982Abstract Following the principle of connectivity in two phase systems, composites of SbSI and Spurrs epoxy in 1:3 and 3:3 modes were prepared. Piezoelectric strain coefficients d 33 and d h, and dielectric constant K were measured over a temperature range encompassing the transition temperature.
A. S. Bhalla +3 more
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