Flexible high dielectric polymer composite material and preparation method thereof

Abstract

The invention discloses a flexible high-dielectric polymer composite material and a preparation method thereof. The flexible high-dielectric polymer composite material disclosed by the invention is prepared by taking a fluorine-containing ferroelectric polymer as a basal body and modified graphene as a filler through processes such as liquor mixing, curtain-coating and film-forming, and hot-press molding, wherein the added graphene is grafted with the fluorine-containing polymer on the surface by adopting a click chemistry method and thermally reduced by hydrazine hydrate; the grafted fluorine-containing polymer not only can be used for improving dispersion of the graphene, but also can be well compatible with the fluorine-containing ferroelectric polymer basal body to strengthen the interface binding force between the polymer basal body and the graphene filler. The flexible high-dielectric polymer composite material prepared by the preparation method disclosed by the invention has the characteristics of being high in dielectric constant, low in dielectric loss, good in flexibility, excellent in mechanical performance, and the like, is suitable for manufacturing advanced electronic electrical appliance equipment such as an embedded type capacitor, a field-effect transistor, and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic composite material preparation, and relates to a dielectric material, in particular to a flexible high-dielectric polymer composite material and a preparation method thereof. Background technique [0002] In recent years, dielectric materials with high dielectric constant and low dielectric loss have been widely used in electronic and electrical equipment such as embedded capacitors, cable terminals, and field-effect transistors. With the development of the electronics industry towards miniaturization, embedded capacitors and field effect transistors have been widely used, which requires more and more flexibility and easy processing of dielectric materials. [0003] At present, there are many studies on improving the dielectric constant of the polymer matrix, and its preparation mainly includes two ways: adding ceramic particles with high dielectric constant or filling conductive particles. Th...

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Problems solved by technology

The addition of ceramic particles is not very effective in increasing the dielectric constant of the composite material. Usually, it is necessary to add ceramics with a volume fraction of more than 50%, so that the dielectric constant of the composite material can reach about 50, but at this time the material usually becomes Very brittle, poor mechanical properties, loses flexibility

The mechanism of adding conductive particles is to construct a threshold percolation system, which usually requires a small amount of filler (generally less than 20% volume fraction), which can guarantee the mechanical properties and flexibility of the composite material to a certain extent, but When the conductive filler is close to the percolation threshold, the dielectric loss of the composite material will increase sharply, thereby affecting the dielectric properties of the material

At the same time, when preparing polymer-based composites, due to the polarity difference between the polymer and the filler and the agglomeration effect of the filler particles, the dispersion of the filler in the polymer matrix is ​​often poor, and the filler is incompatible with the polymer. As a result, the interface polarization is strengthened and the dielectric loss is increased, which limits the further improvement of the performance of the composite material.

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