Surface modified graphene polymer-based piezoresistive composite material and preparation method thereof

A composite material and surface modification technology, applied in the field of piezoresistive composite materials and their preparation, to achieve the effects of excellent piezoresistive repeatability, reducing surface energy and improving compatibility

Inactive Publication Date: 2012-09-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]For traditional polymer-based piezoresistive composites, the main problem is that the piezoresistive composites filled with carbon black have low sensitivity, high loading, Poorly Reproducible Issues
Although the piezoresistive composite material filled with carbon nanotubes has high piezoresistive sensitivity and low filling content, it is difficult to achieve ideal repeatability in cyclic tests for such excellent piezoresistive properties.

Method used

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  • Surface modified graphene polymer-based piezoresistive composite material and preparation method thereof
  • Surface modified graphene polymer-based piezoresistive composite material and preparation method thereof
  • Surface modified graphene polymer-based piezoresistive composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) All test materials were dried in a vacuum drying oven at 80°C for 24 hours before the experiment to remove the moisture in them. Graphite oxide prepared by the Hummers method was dispersed in water at a concentration of 2.5 mg / mL, and the pH value was adjusted to 8 with ammonia water, and a uniformly dispersed brownish-brown graphene oxide dispersion could be obtained by ultrasonic treatment. In the next step, 20 mL of ethanol solution with a concentration of 5.0 mg / mL octadecylamine prepared in advance was added to 40 mL of graphene oxide dispersion, and heated at reflux at 90 °C for 20 h. Then 0.1 mL of hydrazine hydrate (the ratio of hydrazine hydrate to graphite oxide is 1 mL:1 g) was added to the mixture, and the reaction was continued at 90 °C for 4 h. After the reaction, the product was repeatedly washed with hot ethanol at 60 °C through the mobile phase filter. After cleaning, the obtained product was put into a vacuum drying oven at 70°C and stored for 24 h...

Embodiment 2

[0038] 1) The surface alkylation modified graphene process is the same as Example 1;

[0039] 2) Weigh 50 mg of the surface alkylation-modified graphene obtained in the first step, then add it into 50 mL of xylene solvent and perform ultrasonic treatment for 2 hours, and a stable graphene concentration of 1 mg / mL can be obtained. Dispersions. In the next step, 2 g of silicone rubber was dissolved in 10 mL of xylene solvent to prepare a silicone rubber dispersion with a concentration of 0.2 g / mL, mixed with the surface alkylation-modified graphene dispersion and stirred at room temperature for 30 minutes, and then the mixture was transferred to The solvent was evaporated by magnetic stirring at 80°C on a hot stage, and the obtained product was further dried in a vacuum oven at 80°C.

[0040] 3) In step 2) to obtain a composite material with a graphene volume fraction of 1.19%, add a curing agent tetraethyl orthosilicate and stir evenly, then put it into a mold and cure it at r...

Embodiment 3

[0045] 1) The surface alkylation modified graphene process is the same as Example 1;

[0046] 2) Weigh 60 mg of the surface alkylation-modified graphene obtained in the first step, then add it into 60 mL of xylene solvent and perform ultrasonic treatment for 2 hours, and a stable graphene concentration of 1 mg / mL can be obtained. Dispersions. In the next step, 2 g of silicone rubber was dissolved in 10 mL of xylene solvent to prepare a silicone rubber dispersion with a concentration of 0.2 g / mL, mixed with the surface alkylation-modified graphene dispersion and stirred at room temperature for 30 minutes, and then the mixture was transferred to The solvent was evaporated by magnetic stirring at 80°C on a hot stage, and the obtained product was further dried in a vacuum oven at 80°C.

[0047] 3) Add 7 parts of tetraethyl orthosilicate to the composite material with a graphene volume fraction of 1.43% in step 2) and stir evenly, then put it into a mold and cure it at room temper...

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Abstract

The invention discloses a surface modified graphene polymer-based piezoresistive composite material and a preparation method thereof. According to the polymer-based piezoresistive composite material, room-temperature vulcanized silicon rubber is used as a matrix, and surface modified graphene grafted and modified by octadecylamine is used as a conductive filler; in the reaction of grafting the octadecylamine to graphene, the mass ratio of the octadecylamine to graphene oxide is 1:1; and the graphene volume fractions of the surface modified graphene / silicon rubber composite material are respectively 0.96 percent, 1.19 percent and 1.43 percent. The surface modified graphene / silicon rubber piezoresistive composite material prepared by a solution blending method has the advantages of graphene dispersion uniformity, low percolation threshold value, high piezoresistive sensitivity, high piezoresistive repeatability, low preparation cost and the like.

Description

technical field [0001] The invention belongs to the field of polymer-based piezoresistive composite materials, and in particular relates to a piezoresistive composite material using surface-modified graphene as a conductive filler and a preparation method thereof. Background technique [0002] Polymer-based piezoresistive composite materials have the advantages of good flexibility, high piezoresistive sensitivity, and low cost, thereby overcoming the shortcomings of traditional metals and silicon semiconductors such as high brittleness, difficulty in bending, and high cost. With the development of electronic devices in the direction of flexibility, flexible sensor materials have received extensive attention. Polymer-based all-organic piezoresistive composites are an ideal alternative material for stress-strain sensors. [0003] For the traditional polymer-based piezoresistive composites, the main problem is that the piezoresistive composites filled with carbon black have lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K9/04C08K3/04
Inventor 党智敏侯毅查俊伟
Owner UNIV OF SCI & TECH BEIJING
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