A kind of core-shell nanoparticle/polyvinylidene fluoride composite material and preparation method thereof

Abstract

The invention provides a core-shell nanoparticle / polyvinylidene fluoride composite material and a preparation method thereof and belongs to the technical field of composite materials. The core-shell nanoparticle / polyvinylidene fluoride composite material is compounded by doping three-layer core-shell nanoparticles into polyvinylidene fluoride, wherein the core of the three-layer core-shell nanoparticles is silicon dioxide, the first-layer shell is reduced graphene oxide, and the second-layer shell is chitosan. The preparation method comprises the following steps of: grafting a silane couplingagent KH550 to the surfaces of SiO2 nanoparticles, coating by the graphene oxide, preparing the three-layer core-shell nanoparticles, adding the three-layer core-shell nanoparticles into a mixed solution of the polyvinylidene fluoride and N-N-dimethylformamide, removing bubbles, heating and preparing films and the like. The core-shell nanoparticle / polyvinylidene fluoride composite material prepared by the invention has the characteristics of high dielectric constant and low dielectric loss; the preparation method has the advantages of simple process and low cost and is suitable for industrialproduction and application of various types of factories.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride composite material, in particular to a polyvinylidene fluoride composite material containing three-layer core-shell structure nanoparticles with high dielectric constant and low dielectric loss and a preparation method thereof, belonging to composite materials field. [0002] technical background [0003] With the rapid development of global informatization and electronic industry, higher performance requirements are put forward for electrical equipment. Therefore, the preparation of polymer-based composite materials through a certain composite process between the dielectric body and the polymer matrix has gradually become a new research field in the field of high-dielectric materials due to its good manufacturability, flexibility and dielectric properties. trend. At present, polymer-based dielectric composites are mainly divided into two categories: ceramic polymer-based composites and conductive pol...

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Problems solved by technology

[0006] There are currently two main ways to increase the dielectric constant of polyvinylidene fluoride: the first way is to add ceramic fillers. The dielectric constant of ceramic fillers is relatively high, but the interface polarization is caused by the small difference in electrical properties between ceramics and polymers. Weaker, so the dielectric constant of the composite material can only reach about 50-100 at room temperature; at the same time, to achieve this level of dielectric constant, the content of the ceramic body is usually required to reach more than 50vol%, but high content will lead to composite The uniformity, manufacturability and flexibility of the material are significantly reduced; the second way is to add conductive fillers, which can greatly improve the composite material through the huge difference in electrical properties to produce strong interfacial polarization, form a microcapacitive structure or cause seepage effects. Dielectric constant, the dielectric constant of the composite material is greatly increased at a lower content, but at the same time it causes a sharp increase in the dielectric loss of the system