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A multilayer core-shell structure graphene-based dielectric elastomer composite material and its preparation

A multi-layer core-shell structure and alkenyl dielectric technology, which is applied in the field of dielectric elastomer preparation, can solve the problems of increased dielectric loss, reduced electrical breakdown strength, and large amount of added particles, so as to improve the dielectric constant, Reduce dielectric loss and improve the effect of electrostrain

Active Publication Date: 2018-11-02
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two main methods to increase the dielectric constant of dielectric elastomers: one is to add high-dielectric ceramic fillers. Although this method can effectively improve the dielectric constant of dielectric elastomers, the amount of particles added is large, resulting in elastic mode Increased amount, many material defects, low electrical breakdown strength
The second is to add conductive fillers. This method is based on the percolation threshold theory. When the conductive filler reaches the percolation threshold, the dielectric constant is the largest; but when the amount of conductive filler reaches or exceeds the percolation threshold, the dielectric elastomer forms a conductive path. The dielectric loss is greatly increased, and the electrical breakdown strength is greatly reduced
This preparation method reduces the dielectric loss and improves the electrical breakdown strength, but the polydopamine insulating layer coated on the outer surface of graphene oxide will reduce the dielectric constant of the dielectric elastomer

Method used

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  • A multilayer core-shell structure graphene-based dielectric elastomer composite material and its preparation
  • A multilayer core-shell structure graphene-based dielectric elastomer composite material and its preparation
  • A multilayer core-shell structure graphene-based dielectric elastomer composite material and its preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) 20mg of dopamine was added to 100ml of water, and tris (Tris) was added to adjust the pH of deionized water to 8.5 to obtain a dopamine solution;

[0036] (2) 1 g of barium titanate particles with a particle size of 30 nm was added to the dopamine aqueous solution, mechanically stirred at 25 ° C for 18 h, after the reaction was completed, diluted with deionized water to neutrality, suction filtration, and vacuum drying to obtain polydopamine package Barium titanate-coated ceramic particles;

[0037] (3) ultrasonically dispersing 0.5g graphene oxide in 1000ml deionized water, and 800W ultrasonic dispersion for 6h to obtain an aqueous solution of graphene oxide;

[0038] (4) 1 g of polydopamine-coated barium titanate ceramic particles was added to the graphene oxide aqueous solution, mechanically stirred at 25°C for 16 h, diluted with deionized water to neutrality, vacuum filtered, and vacuum dried to obtain graphene oxide Modified polydopamine coated high dielectric...

Embodiment 2

[0046] The preparation method is the same as that in Example 1, except that the amount of dopamine added in step (1) is 33 mg, and the amount of graphene-based ceramic particles in step (6) is 4.5 g. The test results are shown in Table 1.

Embodiment 3

[0048] The preparation method is the same as in Example 1, except that the consumption of dicumyl peroxide in step (6) is 2g. The test results are shown in Table 1.

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Abstract

The invention discloses a multi-layer core shell structure graphene based dielectric elastomer composite material and a preparation method, and belongs to the technical field of dielectric elastomer preparation. The composite material comprises an elastomer matrix, a cross-linking system and multi-layer core shell structure graphene based dielectric packing, wherein the multi-layer core shell structure graphene based dielectric packing is formed by coating the surface of high dielectric ceramic packing with a polydopamine layer, grafting the surface of the polydopamine layer with a graphene oxide layer and reducing the graphene oxide layer into a graphene layer. Dielectric elastomer is filled with a small amount of multi-layer core shell structure graphene based dielectric packing to prepare the dielectric elastomer composite material. The dielectric constant of the dielectric elastomer is effectively improved while low dielectric loss is kept, and the problems of high filling volume, large elasticity modulus of composite materials, high dielectric loss, low electric breakdown strength and the like of the ceramic packing for filling the elastomer.

Description

technical field [0001] The invention belongs to the technical field of dielectric elastomer preparation, in particular to a multi-layer core-shell structure graphene-based dielectric elastomer composite material and preparation thereof. Background technique [0002] Dielectric elastomers have the characteristics of large electric deformation, short response time, small viscoelastic hysteresis loss, good flexibility and high conversion efficiency. At present, dielectric elastomers have problems such as low dielectric constant, large dielectric loss, and small electric deformation. [0003] There are two main ways to improve the dielectric constant of dielectric elastomers: one is to add high dielectric ceramic fillers. Although this method can effectively improve the dielectric constant of dielectric elastomers, the amount of added particles is large, resulting in elastic modulus. The amount increases, the material defects are many, and the electrical breakdown strength is l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/02C08K9/10C08K9/02C08K3/22C08K3/24
CPCC08K3/22C08K3/24C08K9/02C08K9/10C08K2003/2241C08K2201/003C08K2201/011C08L9/02
Inventor 杨丹阮梦楠郭文莉黄朔李树新伍一波商育伟王浩
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY