Journal ArticleDOI
Piezoelectricity in polyvinylidenefluoride
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TLDR
A review of the physical properties of polyvinylidenefluoride (PVDF) with particular emphasis on its piezoelectric activity is given and the applications of this material are discussed as discussed by the authors.Abstract:
A review of the physical properties of polyvinylidenefluoride (PVDF) with particular emphasis on its piezoelectric activity is given and the applications of this material are discussed. PVDF is a semicrystalline polymer whose crystalline domains appear in four different forms. These forms may be interconverted by the application of heat, electrical fields, and pressure. Thermal poling or corona poling will orient the molecular dipoles in the crystalline parts and thus yield a permanent polarization. This polarization causes, by means of differences in the dielectric and elastic properties of the amorphous and crystalline parts, the piezoelectricity of PVDF. The piezoelectric constant d31 reaches values of about 35 pC/N at room temperature. At decreasing temperatures a drop of d31 and d33 is observed. Compared to other piezoelectric materials, PVDF has such unique properties as flexibility, ruggedness, availability as thin films, and low acoustic impedance, but a somewhat smaller electromechanical coupling factor. Applications of PVDF are in transducers for audiofrequency, ultrasonic, underwater, and electromechanical use and in pyroelectric and optical devices.read more
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Ferroelectric properties of vinylidene fluoride copolymers
TL;DR: In this article, the ferroelectric properties of copolymers of vinylidene fluoride with trifluoroethylene and tetrafluorethylene are described with special interest in their polarization reversal and phase transition behavior.
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Pyroelectric devices and materials
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Intelligent structures for aerospace - A technology overview and assessment
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Journal ArticleDOI
Electroactive poly(vinylidene fluoride)-based structures for advanced applications.
Clarisse Ribeiro,Carlos M. Costa,Daniela M. Correia,Daniela M. Correia,J. Nunes-Pereira,Juliana Oliveira,Pedro Martins,Renato Ferreira Gonçalves,Vanessa Fernandes Cardoso,Senentxu Lanceros-Méndez +9 more
TL;DR: A number of reproducible and effective methods to produce β-PVDF-based morphologies/structures in the form of dense films, porous films, 3D scaffolds, patterned structures, fibers and spheres are presented.
Journal ArticleDOI
Piezoelectric Composite Materials for Ultrasonic Transducer Applications. Part I: Resonant Modes of Vibration of PZT Rod-Polymer Composites
TL;DR: In this paper, the PZT rod-polymer composites have been used for low-frequency hydrophone applications and the effect of temperature on the electromechanical properties of the composite has also been investigated.