▎ 摘　　要

NOVELTY - Composite material comprises copolymer resin including first repeating unit including polyacrylonitrile; and filler dispersed in the copolymer resin. The filler includes carbon material doped with sulfur. USE - The composite material is useful for producing carbon fibers. ADVANTAGE - The composite material can be achieved high efficiency stabilization at low temperature, so that greatly improving economic feasibility of the process; has low temperature in the stabilization process by introducing repeating unit containing catechol group; and improved flame retardancy by adding carbon material doped with sulfur. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing composite material comprising (a) preparing filler including a carbon material doped with sulfur, (b) preparing copolymer resin by polymerizing starting material including precursor of the first repeating unit, and (c) mixing the filler and the copolymer resin.