Preparation method of composite material with high dielectric constant and low dielectric loss

Abstract

The invention relates to a method for preparing a high-performance dielectric material through external field auxiliary particle arrangement, and aims to improve the relative dielectric constant of the material and reduce the dielectric loss or maintain the dielectric loss in a low range. According to the method, conductive filler and high-dielectric ceramic filler are mixed into a polymer matrix,and particles are assisted to move in the matrix under the action of an external field (such as an electric field, a magnetic field and a shearing field) to obtain an oriented structure in directional arrangement. The dielectric constant of the material is greatly improved by a large number of micro capacitors formed by the oriented conductive filler, and the dielectric loss of the material is reduced by the ceramic particles doped in the oriented structure. The high-performance dielectric material prepared by the method has a huge application prospect in the fields of wearable equipment, dielectric elastomers, supercapacitors and the like.

Description

【Technical Field】 [0001] The invention relates to the technical field of electronic materials, and in particular to the preparation of a three-phase dielectric composite material with high dielectric constant and low dielectric loss. [0002] 【technical background】 [0003] With the development of science and technology, high-performance dielectric materials have great application markets and prospects in electronic device industries such as wearable devices, dielectric elastomers, and supercapacitors. Due to the defects of traditional ceramic dielectric materials such as high density, poor processability, and low breaking strength, they can no longer meet the needs of today's society for dielectric materials. Therefore, composite dielectric materials came into being, high-dielectric filler polymer-based dielectric materials, and the preparation method is simple. However, it has been found that on the one hand, although high content of dielectric filler particles can obtain ideal ...

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Problems solved by technology

However, it has been found that, on the one hand, although a high content of dielectric filler particles can obtain relatively ideal dielectric properties, it will cause serious damage to the flexibility of the polymer itself, and the high amount of filler will greatly increase the material cost; on the other hand, the conductive Filled polymers and composite materials can obtain extremely high dielectric constant at a low filler content, but the dielectric loss of the system will increase accordingly, and the dielectric loss is too high, which affects the actual application effect of the material

Some articles have reported that external field orientation can improve the dielectric of conductive filler polymer-based composites, but there are problems such as the serious leakage current and the increase of dielectric loss caused by the formation of conductive paths after orientation.

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