Process for producing a poly(vinyliden fluoride) dielectric material for capacitor with rich beta cristalline phase
AssigneeQueen Mary University of London
InventorsEmiliano Bilotti, Michael J. Reece
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Abstract
The present invention is concerned with a dielectric material comprising a fluoropolymer, wherein at least part of the crystalline region of the fluoropolymer is in the β-phase. The dielectric material of the present invention may show relaxor-like ferroelectricity. The present invention also relates to a novel method of producing such a material, and the use of such a material in a high energy density capacitor. The method comprises layering sheets of PVDF on one another and applying pressure to the multilayer under a temperature which is preferably within 40° C. of the temperature of fusion. Further, the film is preferably quenched.
Claims19
A dielectric material comprising a fluoropolymer, wherein the fluoropolymer comprises poly(vinylidene fluoride) (PVDF), wherein greater than 85% of the crystalline region of the PVDF is β-phase.
A process for producing a fluoropolymer based dielectric material, such as a film, comprising the steps of (a) providing a layered fluoropolymer sample and (b) pressing the layers of the layered fluoropolymer sample together via the application of pressure.
Dependencies are inferred from the claim text.