Method for preparing polymer/graphene composite material

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...

AI Technical Summary

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, although some reports related to nano-graphite microplate (or graphene microplate) composite material (Jiang BZ et al.J Mater Sci 2008 43,5092-5101 (2008); Du XF et al.Chem Mater 20(6 ), 2066-2091(2008); Chen et al.Adv Funct Mater17(6):898-904(2007)), however, because the thickness of the sheet is tens to hundreds of carbon atomic layers, and its preparation The methods all adopt the traditional blending and compounding technology, and it is difficult to obtain effective uniform dispersion of nano-fillers in the polymer matrix.

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