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A kind of graphene-based dielectric elastomer composite material and preparation method thereof

A dielectric elastomer and graphene-based dielectric technology, which is applied in the field of graphene-based dielectric elastomer composite materials and its preparation, can solve the problems of low electrical breakdown strength, affecting percolation threshold, and high dielectric loss. Achieve high breakdown strength, improve electrical breakdown strength, and reduce dielectric loss

Active Publication Date: 2016-01-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent reduces the percolation threshold (0.25vol.%) of the elastomer composite, increases the dielectric constant of the elastomer composite, and reduces the modulus, but due to the presence of flake graphene oxide in the elastomer matrix to a certain extent The accumulation and agglomeration phenomenon not only affects the further reduction of the percolation threshold, but also the dielectric loss is still high (the dielectric loss is 2.02 at 100Hz), and the electrical breakdown strength is low, which is still not conducive to the application in the field of biomedicine

Method used

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  • A kind of graphene-based dielectric elastomer composite material and preparation method thereof

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Embodiment 1

[0039] (1) Dissolve 100 mg of graphite oxide synthesized by the Hummers method in 200 mL of deionized water, 1000 W ultrasonic dispersion for 1 h, the graphite oxide is exfoliated into flaky graphene oxide with a thickness of about 1 nm, and a stable suspended graphene oxide aqueous solution is obtained;

[0040] (2) Adjust the pH of the graphene oxide aqueous solution prepared in step (1) to 8.5 with 0.24 g of tris hydroxymethylaminomethane solid, add 50 mg of dopamine, and react with mechanical stirring at 60° C. for 6 h. After the reaction, use a microporous membrane to vacuum filter, deionize and wash, and vacuum dry to obtain a dopamine-modified graphene oxide solid;

[0041] (3) the graphene oxide modified by step (2) is ultrasonically dispersed in deionized water, and then with 10g of carboxylated nitrile latex (the brand produced by Zeon company is the carboxylated nitrile latex of Nipol5171H, wherein the solid content 40wt.%, acrylonitrile content is 37wt.%) mixed, 30...

Embodiment 2

[0046] The preparation method is the same as in Example 1, except that the ultrasonic conditions in step (1) are: 300W, 6h; the amount of dopamine used in step (2) is 100 mg; the amount of graphene oxide modified by dopamine in step (3) is 20 mg . The composition of the graphene-based dielectric elastomer composite material obtained in this example is 4 g of carboxylated nitrile rubber, 20 mg of dopamine-modified graphene oxide, and the thickness of the polydopamine organic layer is 2.1 nm. 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 graphite oxide in step (1) is 200 mg, and the consumption of deionized water is 400 mL; the consumption of tris in step (2) is 0.48 g, and the consumption of dopamine It is 200mg; The usage amount of the graphene oxide modified by dopamine in the step (3) is 40mg. The composition of the graphene-based dielectric elastomer composite material obtained in this embodiment is 4g of carboxylated nitrile rubber, 40mg of dopamine-modified graphene oxide, and the thickness of the polydopamine organic layer is 2.1nm. The test results are shown in Table 1.

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Abstract

The invention relates to a graphene-based dielectric elastomer composite material and a preparing method thereof. The composite material comprises an elastomer matrix, graphene oxide dielectric padding and a crosslinking system, wherein the graphene oxide dielectric padding is oxidation graphene with the surface wrapped by a poly-dopamine organic layer and is scattered in the elastomer matrix in a nanometer horizontal layer mode, and an isolation network structure that an oxidized graphene slice layer which is wrapped by the poly-dopamine organic layer wraps latex particles. According to the preparing method, the dopamine bionic ornament oxidization graphene is adopted, the dielectric loss is obviously reduced, the electric breakdown strength is improved, the organic layer thickness of the poly-dopamine can be regulated through the parameters of the modification process of the dopamine, the dielectric constant, the dielectric loss and the electric breakdown strength of the composite material can be adjusted according to the demands, and the graphene-based dielectric elastomer composite material meeting the safety requirement in the biology medical field can be prepared.

Description

technical field [0001] The invention relates to a graphene-based dielectric elastomer composite material and a preparation method thereof, belonging to a conductive filler-doped dielectric elastomer and its preparation technology. The dielectric elastomer maintains a relatively high electrical sensitivity factor (β) At the same time, it has the performance of tunable low dielectric loss and high breakdown strength, which can be used for the development of electroactive polymer drivers. Background technique [0002] Dielectric elastomer is a typical electroactive polymer, which has higher comprehensive properties than ordinary elastomers, including high dielectric constant, low modulus, large electro-induced deformation, high electromechanical coupling coefficient, and short response time , High energy density, small viscoelastic hysteresis loss. Electroactive polymer actuators developed with dielectric elastomers have broad application prospects in the fields of pocket or m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08L9/06C08L9/02C08L33/04C08L13/00C08K9/04C08K9/10C08K3/04C08K5/14C08K3/06
Inventor 宁南英田明马琴张立群刘苏亭
Owner BEIJING UNIV OF CHEM TECH
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