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Preparation method of graphene/polyurethane dielectric elastomer composite material

A dielectric elastomer and composite material technology, applied in the field of composite materials, can solve problems such as increased elastic modulus, decreased breakdown electric field strength, and decreased flexibility of elastomers, achieving reduced modulus increase and increased electrical drive sensitivity , Improve the effect of interface compatibility

Active Publication Date: 2020-10-09
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, conductors or semiconductors are mostly rigid fillers, and the addition of rigid fillers will increase the elastic modulus of the system
For example, Kofod G et al. used silicon oil surface modified titanium dioxide semiconductor as filler (10-25vol%) of SEBS elastomer. Although the deformation of the obtained composite material was improved under low electric field strength, the elastic modulus was greatly increased, and the elastomer was flexible. Decrease, the breakdown electric field strength drops sharply
The above disadvantages greatly limit the development of conductive (semiconductor) filler / dielectric elastomer composites

Method used

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  • Preparation method of graphene/polyurethane dielectric elastomer composite material
  • Preparation method of graphene/polyurethane dielectric elastomer composite material
  • Preparation method of graphene/polyurethane dielectric elastomer composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) Add 1 gram of graphene oxide and 300 ml of N,N-dimethylformamide solvent into a three-necked flask and ultrasonically disperse for 0.5 hours, then add 0.025 g of azobisisobutyronitrile and 0.5 g of Polyethylene glycol (molecular weight 600) with terminal mercapto groups forms a mixture. Vacuumize the three-necked bottle containing the mixture and flush nitrogen, then the above mixture is reacted at 70 degrees Celsius for 8 hours under the protection of nitrogen, and the resulting solid product is suction filtered and used A large amount of deionized water was washed clean, and then vacuum-dried at 60 degrees Celsius for 12 hours to obtain polyethylene glycol-modified graphene oxide obtained by a click chemical reaction;

[0021] 2) Add 1 gram of polyethylene glycol-modified graphene oxide and 300 ml of deionized water into a one-necked bottle and ultrasonically disperse for 0.5 hours, then add 1 gram of sodium borohydride to the three-necked bottle to form a mixture, ...

Embodiment 2

[0024] 1) Same as embodiment 1;

[0025] 2) Same as embodiment 1;

[0026] 3) Add 0.03 g of polyethylene glycol-modified graphene, 2.97 g of thermoplastic polyurethane elastomer particles and 35 ml of tetrahydrofuran into a one-necked bottle, stir for 5 hours until the thermoplastic polyurethane elastomer is completely dissolved and form a uniform mixture, and pour the above mixture Put it into a polytetrafluoroethylene template and spread it out, after 48 hours of natural air drying, then vacuum drying at 35 degrees Celsius for 24 hours to obtain a graphene / polyurethane dielectric elastomer composite film with a thickness of 105 microns.

Embodiment 3

[0028] 1) Same as embodiment 1;

[0029] 2) Same as embodiment 1;

[0030] 3) Add 0.036 g of polyethylene glycol-modified graphene, 2.964 g of thermoplastic polyurethane elastomer particles and 35 ml of tetrahydrofuran into a one-mouth bottle, stir for 6 hours until the thermoplastic polyurethane elastomer is completely dissolved and form a homogeneous mixture, pour the above mixture Put it into a polytetrafluoroethylene template and spread it out, after 48 hours of natural air drying, then vacuum drying at 35 degrees Celsius for 24 hours to obtain a graphene / polyurethane dielectric elastomer composite film with a thickness of 108 microns.

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Abstract

The invention discloses a preparation method of a graphene / polyurethane dielectric elastomer composite material, which comprises the following steps: by using a thermoplastic polyurethane elastomer asa base material and polyethylene glycol modified graphene obtained by click chemical reaction as a dielectric enhanced functional filler, sequentially carrying out solution blending and film castingto obtain the graphene / polyurethane dielectric elastomer composite material. The prepared flexible elastomer composite material has relatively high dielectric constant and relatively good electrodeformation capability.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a preparation method of a graphene / polyurethane elastomer composite material. Background technique [0002] As an electroactive polymer that can generate driving deformation under the action of an electric field, dielectric elastomers have large electro-induced deformation, good flexibility, fast elastic recovery after removing the electric field, high energy density and conversion efficiency, short response time, and high quality. It has many advantages such as light weight and low manufacturing cost, and has great application prospects in actuators, sensors, mechanical energy harvesting systems, and artificial muscles. Although the dielectric elastomer material has excellent flexibility, its dielectric constant is low (usually below 10), which often requires a very high driving electric field (greater than 100V / um) to meet the deformation requirements of practical u...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K9/04C08K3/04C08J5/18
CPCC08J5/18C08J2375/04C08K9/08C08K3/042
Inventor 何富安黎增田
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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