Preparation method of polymer-based high dielectric composites based on three-dimensional core-shell structure

A composite material and three-dimensional skeleton technology, which is applied in the field of preparation of polymer-based high dielectric composite materials, can solve the problems of increased loss of conductive phase, decreased mechanical properties and processing properties of materials, increased loss, etc., and achieves easy operation and applicability and the effect of strong practicability and simple preparation method

Active Publication Date: 2020-03-06
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problems in increasing the dielectric constant of polymer composite materials are: by adding high dielectric ceramic phases in the polymer matrix, although the dielectric constant can be improved, only when the ceramic phase content is very high, the dielectric constant is more obvious. This leads to a significant decrease in the mechanical properties and processing properties of the material, and a substantial increase in the loss; by adding a conductive phase to the insulating polymer matrix, a dielectric constant much higher than that of the matrix can be obtained, but the existence of the conductive phase will lead to loss A significant increase

Method used

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  • Preparation method of polymer-based high dielectric composites based on three-dimensional core-shell structure
  • Preparation method of polymer-based high dielectric composites based on three-dimensional core-shell structure
  • Preparation method of polymer-based high dielectric composites based on three-dimensional core-shell structure

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Embodiment 1

[0038] The preparation method of the polymer-based high-dielectric composite material based on the three-dimensional core-shell structure, the preparation process of the foamed nickel / barium titanate / epoxy resin composite material:

[0039] 1. Pretreatment steps of nickel foam:

[0040] (1) Trim the foamed nickel into a block of 2cm×2cm, put it in a beaker, add acetone solution to submerge the foamed nickel for ultrasonic cleaning for 30 minutes;

[0041] (2) Pour off the acetone solution and add deionized water, and continue to sonicate for 15 minutes;

[0042] (3) Add absolute ethanol and ultrasonic for 15 minutes for cleaning.

[0043] 2. Preparation steps of foamed nickel / barium titanate composite material:

[0044] (1) Add 1.0g of barium titanate powder and 0.7g of polyethyleneimine (PEI) into a beaker, then add 50mL of isopropanol, stir for 4h at room temperature, and then ultrasonic for 30min to obtain a uniformly dispersed barium titanate mixed solution;

[0045] (2) Electrophores...

Embodiment 2

[0051] The preparation method of the polymer-based high-dielectric composite material based on the three-dimensional core-shell structure, and the preparation process of the foamed nickel / barium titanate / epoxy resin composite material. Compared with Example 1, the difference between this embodiment is: controlled sintering The temperature is 1000°C, and a foamed nickel / barium titanate / epoxy resin composite material with a sintering temperature of 1000°C is prepared.

Embodiment 3

[0053] The preparation method of the polymer-based high-dielectric composite material based on the three-dimensional core-shell structure, and the preparation process of the foamed nickel / barium titanate / epoxy resin composite material: Compared with Example 1, the difference lies in: controlled sintering The temperature is 1300°C, and a foamed nickel / barium titanate / epoxy resin composite material with a sintering temperature of 1300°C is prepared.

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Abstract

The invention discloses a preparation method of a three-dimensional framework polymer-based high-dielectric composite material based on a core-shell structure, and relates to the technical field of high-dielectric composite materials. The preparation method comprises the following steps: pretreatment of foamed nickel, preparation of foamed nickel / barium titanate, and preparation of the polymer-based high-dielectric composite material, wherein the polymer-based high-dielectric composite material is divided into three kinds, namely, foamed nickel / barium titanate / epoxy resin, a nickel oxide / barium titanate / epoxy resin composite material and a nickel oxide (nickel) / barium titanate / epoxy resin composite material. According to the prepared polymer-based high-dielectric composite material, a dielectric constant up to 8000 can be obtained under the condition that the loss is lower than 0.1, the dielectric constant and the loss can be conveniently changed by adjusting the electrophoretic deposition amount, the sintering temperature and the oxidation temperature, and the preparation method of the polymer-based high-dielectric composite material has the advantages of being simple, easy to operate, high in applicability and practicability and the like.

Description

Technical field [0001] The invention relates to the technical field of high-dielectric composite materials, in particular to a method for preparing a polymer-based high-dielectric composite material based on a three-dimensional core-shell structure. Background technique [0002] High-dielectric composite materials are widely used in filters, sensors, antennas, and energy storage devices. With the development of high-integration electronic devices, it is necessary to greatly increase the permittivity of existing dielectric materials while maintaining low loss. Considering that polymer materials have the advantages of low dielectric loss, high breakdown field strength, and easy processing and forming, polymer-based high-dielectric composite materials have become a research hotspot at home and abroad. [0003] At present, there are two main ways to increase the dielectric constant of polymer composites: (1) The introduction of high-dielectric fillers into the insulating polymer matrix...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/00C08K9/02C08K7/24C08K3/24
Inventor 史志成朱晓彤杨洁左衡
Owner OCEAN UNIV OF CHINA
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