▎ 摘　　要

NOVELTY - Two quantity of same solvent is weighed separately. Graphene powder is added to one quantity of solvent and dispersed, to obtain graphene suspension. Polyacrylonitrile powder is added to the another quantity of solvent and heated, to obtain polyacrylonitrile solution. Obtained suspension is mixed with the obtained polyacrylonitrile solution, deaerated, spinning process is performed using the obtained graphene-modified polyacrylonitrile solution. Resultant fiber precursor is oxidized and carbonization is performed, to obtain graphene-modified polyacrylonitrile-based carbon fibers. USE - Preparation of graphene-modified polyacrylonitrile-based carbon fibers used for electrical conductive material, anti-static material and thermal conductive material. ADVANTAGE - The method economically and efficiently provides graphene-modified polyacrylonitrile-based carbon fibers having excellent conductivity and mechanical property, by a simple process. DETAILED DESCRIPTION - Two quantity of same solvent is weighed separately. Graphene powder (0.01-10 mass %) is added to one quantity of solvent, and ultrasonically dispersed, to obtain graphene suspension. Polyacrylonitrile powder (15-30 %mass) is added to the another quantity of solvent, and dispersed for 1-48 hours. The resultant dispersed solution is slowly heated at 40-75 degrees C under water bath, and stirred uniformly to obtain polyacrylonitrile solution. Obtained graphene suspension is slowly mixed with the obtained polyacrylonitrile solution, stirred at 20-75 degrees C for 1-24 hours, and deaerated to obtain graphene-modified polyacrylonitrile solution. The wet method or dry-jet wet spinning process is performed using obtained graphene-modified polyacrylonitrile solution as spinning solution, to obtain fiber precursor. Obtained fiber precursor is oxidized at 165-285 degrees C, low-temperature carbonization is performed at 300-900 degrees C under protection atmosphere, and then high-temperature carbonization is performed at 900-1800 degrees C, to obtain graphene-modified polyacrylonitrile-based carbon fibers.