Method for preparing polymer/graphene composite material

A composite material and polymer technology, applied in the field of nanomaterials, can solve the problems of difficult to restore crystal structure, self-aggregation, structural defects, etc., and achieve the effect of easy large-scale production, overcoming self-aggregation, and realizing large-scale production.

Active Publication Date: 2010-10-20
HUAQIAO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the structure of graphene oxide will be more inclined to graphite itself in the subsequent reduction process, it is still difficult to completely restore the original crystal structure of the graphite layer, resulting in structural defects, which not only affect its electrical conductivity, but also bring Due to the serious self-agglomeration, graphene cannot be dispersed in the polymer most effectively, and it is difficult to give full play to the enhancement effect and intrinsic advantages of graphene.
[0004] Previously

Method used

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  • Method for preparing polymer/graphene composite material
  • Method for preparing polymer/graphene composite material
  • Method for preparing polymer/graphene composite material

Examples

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Embodiment 1

[0028] A method for preparing a polymer / graphene composite material is realized by the following scheme: Accurately weigh 0.1 g of expanded graphite micropowder, and uniformly disperse it in 320mL styrene monomer by mechanical stirring to form a suspension of expanded graphite micropowder, and After this expanded graphite powder suspension is divided into 4 parts on average, each part is packed into a polytetrafluoroethylene ball mill jar with a volume of 100mL together with zirconia grinding balls respectively. The weight ratio is about 10000: 1, put four polytetrafluoroethylene ball mill jars equipped with zirconia balls and expanded graphite suspension symmetrically into the planetary mill and ball mill for 30 hours at a speed of 300 rpm to obtain graphene / styrene suspension, the graphene / styrene suspension obtained by ball milling is poured into a beaker, and azobisisobutyronitrile is added as an initiator to initiate polymerization relative to 1.0-1.5wt% mass fraction of ...

Embodiment 2

[0030] A method for preparing a polymer / graphene composite material is realized by the following scheme: accurately weigh 20.0 g of graphite flake powder, and uniformly disperse it in 1000 mL of methyl methacrylate by mechanical stirring to form graphite flake powder suspension, This flaky graphite micropowder suspension and alumina grinding balls are packed into a basket mill grinding tank with a volume of 1500 mL, and ball milled at a speed of 320 rpm for 50 hours to obtain a graphene / methyl methacrylate suspension. Pour the graphene / methyl methacrylate suspension obtained by ball milling into a beaker, and add 0.1-2.5 wt% dibenzoyl peroxide relative to the methyl methacrylate monomer as an initiator to initiate polymerization , to obtain polymethyl methacrylate / graphene composites.

Embodiment 3

[0032] A method for preparing a polymer / graphene composite material is realized by the following scheme: Accurately weigh 30.0g of highly oriented graphite powder and uniformly disperse it in 3000mL of N,N-dimethylformaldehyde containing 100g of polystyrene by mechanical stirring In the amide solution, a high-oriented graphite powder suspension is formed, and the high-oriented graphite powder suspension and agate balls are put into a horizontal ball mill tank with a volume of 5000mL. The weight ratio between the agate ball and the high-oriented graphite powder is About 4500:1, ball milling at a speed of 350 rpm for 60 hours to obtain a graphene styrene solution suspension, pour the graphene styrene solution suspension obtained by ball milling into a beaker, and add a sufficient amount of water Alternatively, alcohol is used as a precipitant to precipitate the polystyrene / graphene composite from the solvent, and the polystyrene / graphene composite is filtered out, washed thorough...

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Abstract

The invention discloses a method for preparing a polymer/graphene composite material, which comprises: firstly, uniformly dispersing graphite powder in a polymer liquid medium, and grinding and stripping the graphite by using grinding balls to obtain polymer/graphene suspension; and secondly, obtaining the polymer/graphene composite material by adopting a method of adding a precipitator into the polymer/graphene suspension to precipitate the polymer and graphene from the solution, or a method of directly initiating the polymerization of a polymer monomer or a method of curing a prepolymer of the polymer. The method is a new in-situ graphene preparation and compounding method. Once generated, the graphene is enveloped and isolated by polymer molecules or the prepolymer monomer, so the self-agglomeration of the graphene is prevented effectively. In addition, the mechanical grinding in the polymer liquid medium ensures the full mixing of the filler and the polymer, so that the graphene can disperse in a polymer substrate more effectively. And the mechanical ball grinding process makes scale expansion and the realization of industrial production easier.

Description

technical field [0001] The invention relates to a method for preparing a polymer-based graphene composite material, which belongs to the technical field of nanometer materials. Background technique [0002] The latest research shows that when the thickness of graphite crystals is less than 10 carbon atomic layers (thickness is generally less than 5 nanometers), graphite materials will exhibit a series of excellent properties that are completely different from ordinary three-dimensional graphite. This atomically thick graphite flake is called graphene. Studies have shown that the specific surface area of ​​graphene can be as high as 2600m2 / g; the Young's modulus is about 1100GPa; the fracture strength is 125GPa; the excellent mechanical strength and thermal conductivity of graphite crystals are retained, which are 1060GPa and 5000W / m·K respectively. In addition, graphene also exhibits excellent electron transport capabilities, and its electron mobility is as high as 15000 cm...

Claims

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Application Information

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IPC IPC(8): C08F2/44C08K3/04C09C1/46C09C3/04C08F112/08C08F120/14C08F265/08C08L25/06C08L63/00C08L101/02C08L51/00
Inventor 陈国华赵卫峰吴杭赵立平
Owner HUAQIAO UNIVERSITY
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