New type of graphene conductive composite material, high strength becomes a bright spot

Driven by the innovative technologies of new materials such as graphene, carbon nanotubes and new composite materials, various universities, institutions and technology companies have carried out various in-depth studies on these new materials. New materials can well replace traditional metal materials and other traditional materials. For example, it is said that the silicon era is coming to an end, and graphene will bring a whole new era. Recently, James Tour, a chemist at Rice University in the United States, and materials scientists Pulickel Ajayan and Rouzbeh Shahsavari at Rice University, and researchers from Beijing University of Aeronautics and Astronautics have developed a very tough composite material with excellent electrical conductivity. This material is mainly composed of a series of high molecular polymers such as epoxy resin and graphene. The preparation method of the graphene epoxy resin composite material is different from the typical preparation methods of the graphene composite material such as the melt blending method, the solution blending method, and the in-situ polymerization method. It firstly processes the carbon source, polyacrylonitrile, and nickel powder. Mix, use cold pressing technology to compact the material, then remove nickel through heating and chemical treatment to obtain a porous 3D stent, and finally use vacuum to inject epoxy into the stent. It is worth mentioning that the researchers mixed multi-walled carbon nanotubes as a reinforcing material into the graphene foam. This approach makes the composite material hardness about 17 times higher than that of pure epoxy resin, and the conductivity is about per centimeter. 14 Siemens. The researchers said that the material can well replace the currently used carbon composite resin in the future aerospace and civil fields. In fact, the use of carbon fiber composite materials in the aerospace and automotive industries to make parts is nothing new. As early as 1950, the Wright-Patterson Air Force Base in the United States began to study the use of rayon to make carbon fiber. So far, the proportion of carbon fiber composite materials used in many large fighter jets in the United States has been greatly increased. For example, the fourth-generation combat effectiveness F-22 uses about 24% of carbon fiber composite materials, and Lockheed Martin is manufacturing F The carbon fiber composite material is as much as 35% for the -35 fighter.