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Polymer dielectric elastomer as well as preparation method and application thereof

A technology of dielectric elastomers and polymers, applied in the direction of testing dielectric strength, measuring electricity, strength characteristics, etc., can solve the problems of low sensitivity and low dielectric constant of sensors

Active Publication Date: 2021-05-04
HENAN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity of these sensors is also relatively low because the materials commonly used to make dielectric elastomers have low dielectric constants (2.8~4.8)

Method used

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  • Polymer dielectric elastomer as well as preparation method and application thereof
  • Polymer dielectric elastomer as well as preparation method and application thereof
  • Polymer dielectric elastomer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of PDA@ZnO

[0035] 3 g of ZnO nanoparticles were ultrasonically dispersed in 400 mL of Tris-HCl (0.01M, PH=8.5) solution, and then poured into a clean 500 mL round bottom flask. Weigh 1.5 g of dopamine hydrochloride, and slowly add it into the round bottom flask under continuous stirring. After bubbling oxygen into the round bottom flask for three minutes, it was sealed with a rubber stopper. After the reaction lasted for 24 h, it was centrifuged and washed with deionized water, and finally dried in a vacuum oven at 60 °C for 24 h to obtain PDA@ZnO nanoparticles.

Embodiment 2

[0037] Preparation of EVA membrane (film 1)

[0038] Take 2 g of EVA and dissolve it in 20 mL of tetrahydrofuran solvent. After stirring continuously at room temperature for 1 h, add 4 g of di-n-butyl adipate, and then continue stirring for 1 h. Finally, it was poured into a glass petri dish and dried in a vacuum oven at 60 °C for 24 h to obtain an EVA film (film 1).

Embodiment 3

[0040]Preparation of PDA@ZnO / EVA Polymer Dielectric Elastomer (Film 2)

[0041] 0.32 g of PDA@ZnO nanoparticles were ultrasonically dispersed in 20 mL of tetrahydrofuran solvent, and then 2 g of EVA was added. After stirring continuously at room temperature for 1 h, 4 g of di-n-butyl adipate was added, and stirring was continued for another 1 h. Finally, it was poured into a glass petri dish and dried in a vacuum oven at 60 °C for 24 h to obtain a PDA@ZnO / EVA polymer dielectric elastomer (film 1).

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Abstract

The invention discloses a polymer dielectric elastomer as well as a preparation method and application thereof, and according to the polymer dielectric elastomer, through auto-polymerization of dopamine on the surfaces of zinc oxide nano-particles, the coating of the zinc oxide nano-particles by the polydopamine is of a typical core-shell structure (PDA@ZnO). The PDA@ZnO is doped in an ethylene-vinyl acetate copolymer (EVA) to prepare the PDA@ZnO / EVA polymer dielectric elastomer. The PDA@ZnO / EVA polymer dielectric elastomer disclosed by the invention is remarkably improved in dielectric property and breakdown strength, and can generate large deformation and displacement in a low electric field when being applied to an electric actuator. The PDA@ZnO / EVA polymer dielectric elastomer has excellent mechanical properties, and the dielectric properties are improved, so that the polymer dielectric elastomer has high sensitivity and wide sensing range when being used as a sensor for electronic skin.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a PDA@ZnO / EVA polymer dielectric elastomer with enhanced dielectric properties and applications in the fields of electric actuators and electronic skins. Background technique [0002] Dielectric elastomers (DEs), as electronic electroactive polymers, have the advantages of large voltage-induced deformation, fast response, and high energy density. Therefore, DE is often used as an electric actuator and sensor. As an electric actuator, it can directly convert electrical energy into mechanical energy. When it is used as a sensor, it can judge the force and deformation of the sensor according to the change of the collected capacitance signal. . An electric actuator (DEA) is a flexible capacitor with a layer of dielectric elastomer sandwiched between flexible electrodes. When a voltage is applied on both sides of the DEA, the opposite ...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K9/10C08K3/22G01N3/08G01N21/65G01N23/20G01N23/2273G01R31/00G01R31/12
CPCC08K9/10C08K3/22G01R31/1263G01R31/00G01N3/08G01N23/20G01N23/2273G01N21/65G01N2203/0003G01N2203/0017G01N2203/0075G01N2203/0282G01N2203/0676G01N2203/0682G01N2223/056G01N2223/085C08K2003/2296C08K2201/011C08K2201/003C08L23/0853
Inventor 曾超郭东杰黄建建
Owner HENAN UNIVERSITY OF TECHNOLOGY
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