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Silicon rubber based porous dielectric elastomer composite material and preparation method thereof

A technology of dielectric elastomer and composite material, applied in the field of silicone rubber-based porous dielectric elastomer composite material and its preparation, can solve the problems of increasing dielectric constant modulus, decreasing material breakdown voltage, and high local electric field, and achieving Effects of low Young's modulus, high dielectric constant, and low dielectric loss

Inactive Publication Date: 2017-05-10
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high hardness of the ceramic filler, the dielectric constant of the obtained composite material increases with the increase in the amount of the filler, and the modulus also increases significantly, so that it needs to be deformed under a very high voltage; and a large amount of titanic acid The compatibility between barium and silicone rubber matrix is ​​poor, it is difficult to disperse evenly, and it is easy to cause the local electric field to be too high and the breakdown voltage of the material to drop

Method used

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  • Silicon rubber based porous dielectric elastomer composite material and preparation method thereof
  • Silicon rubber based porous dielectric elastomer composite material and preparation method thereof
  • Silicon rubber based porous dielectric elastomer composite material and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a preparation method of the above-mentioned silicone rubber-based dielectric elastomer composite material, comprising the following steps:

[0034] 1) Add the conductive filler to deionized water and stir, then ultrasonically obtain the initial suspension, then add polyethylene glycol to the initial suspension, perform ultrasonication in a water bath after stirring, and obtain the polyethylene glycol / conductive filler suspension;

[0035]2) Mix the polyethylene glycol / conductive filler suspension obtained in step 1) into the polydimethylsiloxane that has been added with curing agent, stir and mix well to obtain polyethylene glycol / polydimethylsiloxane / cured Agent / conductive filler blend; Among them, polydimethylsiloxane is the continuous phase, and the conductive filler is gradually dispersed in polydimethylsiloxane with polyethylene glycol aqueous solution, and finally distributed in polydimethylsiloxane At the junction of alkanes an...

Embodiment

[0053] Raw materials and their proportions:

[0054] The mass ratio of deionized water to polyethylene glycol (PEG, molecular weight 10000g / mol, Aladdin) is 7:3, polydimethylsiloxane (PDMS, Sylgard184, Dow Corning) and tetraethylorthosilicate (TEOS , Dow Corning) with a mass ratio of 10:1, the ratio of the overall mass of polydimethylsiloxane and curing agent mixture to the overall mass of polyethylene glycol and deionized water is 7:3, carbon nanotubes (MYCNTs, Nanocyl S.A.) accounts for the mass percent of all mixtures (polydimethylsiloxane / polyethylene glycol / deionized water containing curing agent) to be respectively 0.1125% (embodiment 1), 0.225% (embodiment 2), 0.45% (Example 3), 0.9% (Example 4) and 1.8% (Example 5).

[0055] Preparation method: Add carbon nanotubes into deionized water and stir, then probe ultrasonically for 30-60 minutes to obtain an initial suspension, then add polyethylene glycol to the suspension, and after stirring, perform water-bath ultrasonica...

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Abstract

The invention relates to a silicon rubber based porous dielectric elastomer composite material, in particular to a silicon rubber based porous dielectric elastomer composite material having high dielectric constant, low dielectric loss and low Young modulus and a preparation method thereof. The silicon rubber based porous dielectric elastomer composite material comprises polydimethylsiloxane, curing agent, polyethylene glycol and conductive filler, a mass ratio of polydimethylsiloxane to the curing agent is 5:1-40:1, a mass ratio of polydimethylsiloxane to polyethylene glycol is 17:10-88:1, and the conductive filler accounts for higher than 0 and lower than or equal to 2.7% of total mass of polydimethylsiloxane / polyethylene glycol / curing agent. The composite material has a uniform microporous structure, and the conductive filler is selectively distributed at an interface of polydimethylsiloxane and polyethylene glycol. The silicon rubber based porous dielectric elastomer composite material has the advantages of high dielectric constant, low dielectric loss and low Young modulus.

Description

technical field [0001] The invention relates to a silicone rubber-based porous dielectric elastomer composite material, in particular to a silicone rubber-based porous dielectric elastomer composite material with high dielectric constant, low dielectric loss and low Young's modulus and a preparation method thereof. Background technique [0002] In today's era of rapid technological development, smart materials represented by polymer-based dielectric elastomers are getting closer and closer to our lives. The dielectric elastomer can couple the electric field and the force field, that is, after the flexible electrodes are coated on both sides of the dielectric elastomer film, when a voltage difference is applied between the two electrodes, the dielectric elastomer film will shrink in thickness and stretch in area , thereby converting electrical energy into mechanical energy. Dielectric elastomers have the characteristics of good flexibility, excellent processability, and larg...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L71/02C08K7/24C08K3/04C08J9/28
CPCC08J9/28C08J2201/0504C08J2383/04C08J2471/02C08K2201/001C08K2201/003C08K2201/011C08L83/04C08L2203/14C08L2205/025C08L2205/03C08L71/02C08K7/24C08K3/04
Inventor 刘正英熊莲郑少笛杨伟杨鸣波谢邦互
Owner SICHUAN UNIV
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