Polyvinylpyrrolidone/graphene composite nanofiber material and preparation method thereof

Abstract

The invention discloses a polyvinylpyrrolidone / graphene composite nanofiber material and a preparation method thereof. An improved Hummers method is adopted for preparing graphite, then, an evenly-mixed polyvinylpyrrolidone / graphene oxide solution can be prepared, next, graphene oxide in the evenly-mixed polyvinylpyrrolidone / graphene oxide solution is reduced into graphene under high-energy ionizing radiation, and the polyvinylpyrrolidone / graphene composite nanofiber material is prepared through an electrostatic spinning technology. According to the preparation method of the polyvinylpyrrolidone / graphene composite nanofiber material, it is avoided that strong reducing agents are introduced, the graphene is evenly dispersed in the composite material and higher in content, the prepared composite nanofiber material is more uniform in property and has higher mechanical property and higher conductive property, and the method is easy and convenient to operate and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of organic polymer / inorganic composite materials, and in particular relates to polyvinylpyrrolidone / graphene composite nanofiber materials and a preparation method thereof. Background technique [0002] Graphene is a carbon atom with sp 2 Hybrid orbitals form a hexagonal flat film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. It is a new material with a single-layer sheet structure composed of carbon atoms, which has excellent electrical conductivity, thermal conductivity and mechanics. performance, thus becoming an ideal nanofiller for the preparation of functional polymer composites. [0003] At present, the preparation of polymer / graphene composite materials mainly adopts the blending method, that is, directly mixing graphene with polymer or polymer solution, and preparing it by precipitation or hot pressing, but because the surface of graphene is inert state, the ...

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Problems solved by technology

[0003] At present, the preparation of polymer / graphene composite materials mainly adopts the blending method, that is, directly mixing graphene with polymer or polymer solution, and preparing it by precipitation or hot pressing, but because the surface of graphene is inert state, the interaction with other media is extremely weak, and there is a strong van der Waals force between graphene sheets and sheets, it is easy to agglomerate, it is difficult to disperse evenly in the polymer or its solution, and the excellent properties of graphene cannot be realized. Well reflected in composites, manifested by low graphene content in composites and inhomogeneous properties of the material

[0004] In addition, the oxidation-reduction method is currently one of the main methods for preparing graphene. This method converts graphite into graphite oxide, and then reduces and exfoliates graphite oxide into graphene. Traditional methods generally use chemical reduction to reduce graphite oxide into graphene. , but the use of strong reducing agents (such as: hydrazine hydrate) is more harmful to the environment, and it is difficult to remove in the post-treatment process, which will affect the composite material

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