A kind of giant dielectric constant polyvinylidene fluoride-based nanocomposite material and its preparation method

Abstract

The invention discloses a giant dielectric constant polyvinylidene fluoride nanocomposite and a preparation method thereof, and belongs to the technical field of synthesis of high dielectric materials. According to the technical scheme, 1 wt%-5 wt% of carbon nanotubes are subjected to ultrasonic dispersion in absolute ethyl alcohol to form a carbon nanotube dispersing agent, one half of the carbon nanotube dispersing agent is added into a mortar to be mixed and ground with 95 wt%-99 wt% of polyvinylidene fluoride for 1 h to 2 h, and then the other half of the carbon nanotube dispersing agent is added for continuous grinding for 2 h to 4 h; the ground mixed powder is put into a drying oven for drying at 70 DEG C for 12 h; the dried mixed powder is put into a powder compressing machine for compressing, and the giant dielectric constant polyvinylidene fluoride nanocomposite is obtained. The prepared giant dielectric constant polyvinylidene fluoride nanocomposite is high in dielectric constant, simple in preparation technology, friendly to environment and low in cost.

Description

technical field [0001] The invention belongs to the technical field of synthesis of high dielectric materials, and in particular relates to a polyvinylidene fluoride-based nanocomposite material with a large dielectric constant and a preparation method thereof. Background technique [0002] With the rapid development of electronics and electrical industry, capacitors are developing toward miniaturization, which requires capacitor materials to have high dielectric constant. Polymer materials have attracted the attention of the dielectric material community in recent years because of their light weight, excellent processability and good compatibility with organic circuit boards. However, the dielectric constant of pure polymer materials is low, so the method of adding high dielectric ceramic materials, semiconductor materials or conductor materials is often used to improve its dielectric properties. Carbon nanotubes are often used as fillers to improve the dielectric properti...

AI Technical Summary

Problems solved by technology

This preparation process is more complicated and consumes more energy (Q. Li, Q.Z. Xue, L.Z. Hao, X.L. Gao, Q.B. Zheng. Large dielectric constant of the chemically functionalized carbon nanotube / polymer composites. Composites Science and Technology. 2008, 68, 2290-2296 )

In summary, the existing preparation methods have problems such as complex operation process, high energy consumption and unfriendly environment, and the prepared materials have relatively low dielectric constant.

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