Polyacrylonitrile-coated graphene composite material as well as preparation method and application thereof

Abstract

The invention discloses a polyacrylonitrile-coated graphene composite material as well as a preparation method and application thereof. A basic unit of the polyacrylonitrile-coated graphene compositematerial is of a core-shell structure, an inner core is a carbon material, an outer shell is a polyacrylonitrile layer, the polyacrylonitrile layer is a single layer or multiple layers, and the carbonmaterial is a carbon material with a graphite lattice structure. According to the polyacrylonitrile-coated graphene oxide composite material, graphene is uniformly introduced into a spinning system,meanwhile, a polymer tightly coats the graphene, polyacrylonitrile isolates the interaction between the graphene, the accumulation tendency of the graphene is reduced, the time required for uniform mixing of the graphene and the polyacrylonitrile is greatly shortened, and the production efficiency is improved. Moreover, the introduced graphene can play roles of a nucleating agent and a template agent in the pre-oxidation and carbonization processes, so that a graphite lattice structure with more complete carbon fibers is obtained, and various properties of the carbon fibers are improved.

Description

technical field [0001] The invention belongs to the technical field of high-performance carbon fiber preparation, and in particular relates to a polyacrylonitrile-coated graphene composite material and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Since its appearance, carbon fiber has shined in various fields because of its excellent performance. However, due to the limitations of various factors such as polymerization system and preparation process, carbon fiber is always far from its theoretical high performance. The main reason is that the current degree of graphitization of carbon fiber is low, and the orientation of gr...

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Problems solved by technology

However, due to the limitations of various factors such as polymerization system and preparation process, carbon fiber is always far from its theoretical high performance. The main reason is that the current degree of graphitization of carbon fiber is low, and the orientation of graphite lattice structure is poor. Researchers A lot of research has been done on how to effectively improve the performance of carbon fibers. At present, an improved idea is to directly introduce graphene with a graphite lattice structure into carbon fibers. In the process of pre-oxidation and carbonization, graphene can be used as the nucleation of the crystallization process. agent and template agent, the method of introducing graphene in the current research is mainly to directly mix polyacrylonitrile and graphene, which can achieve a uniform combination of the two to a certain extent, but the entanglement of polymers leads to graphene It is difficult to disperse evenly into the polymer, and the mixing process takes too long, which seriously restricts the improvement of production efficiency, and graphene is easy to accumulate due to π-π interaction during the dispersion process, and then evolves into defects in fibers. Cannot play the role of graphene

In addition, there is a method of introducing graphene through in-situ bulk polymerization of acrylonitrile and graphene, but the method provided in the current research is also time-consuming

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