a tio 2 Nanomaterial-doped double-layer polyvinylidene fluoride composite medium and preparation method thereof

Abstract

The invention discloses a kind of TiO 2 A nanomaterial-doped double-layer polyvinylidene fluoride composite medium and a preparation method thereof are characterized in that the double-layer polyvinylidene fluoride composite medium is composed of an upper pressure-bearing layer and a lower polarized layer, and the upper pressure-bearing layer is composed of a vertical direction of the electric field. Arranged TiO 2 The nanofibers are filled in polyvinylidene fluoride, and the lower polarized layer is composed of TiO arranged parallel to the direction of the electric field. 2 The nanoarray is filled in polyvinylidene fluoride, and the preparation method is as follows: cast TO NWs / PVDF suspension on the lower polarized layer to form TiO doped with TiO arranged perpendicular to the direction of the electric field 2 For the upper pressure-bearing layer of the nanofibers, the thickness ratio of the upper pressure-bearing layer and the lower polarizing layer is controlled to be (0.5-5): 1, then placed in a vacuum drying oven to dry, then heated, and quickly placed in an ice-water bath for quenching treatment , and then dried in a vacuum drying oven to obtain a composite medium, which has the advantage of increasing polarization and breakdown field strength at the same time.

Description

technical field [0001] The invention belongs to the field of dielectric capacitors, in particular to a TiO 2 Nanomaterial-doped double-layer polyvinylidene fluoride composite medium and preparation method thereof. Background technique [0002] For linear dielectric materials, the calculation of energy density can be expressed as , according to this formula, it can also be seen that the dielectric constant or breakdown strength E b The enhancement can lead to an increase in energy density. Therefore, in order to meet the needs of the development of modern electronic power systems, the pursuit of dielectric materials with high dielectric constant, high breakdown strength, and low energy loss is the top priority to improve the energy storage capacity of dielectric capacitors. In order to obtain dielectric capacitors with excellent energy storage properties, inorganic nano-ceramic materials with high dielectric constant are introduced into polymer matrices with high break...

AI Technical Summary

Problems solved by technology

According to the research status of polymer-based dielectric capacitors, the improvement of the dielectric constant of single-layer nanocomposites is usually at the expense of the breakdown strength of the polymer, because of the huge dielectric difference produced by the addition of high-permittivity inorganic materials. It will lead to serious distortion of the local electric field, thereby reducing the breakdown field strength

Therefore, a single inorganic material combined with a polymer cannot satisfy both the dielectric constant and the breakdown field strength.

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