PREPREG AND CARBON-FIBER-REINFORCED COMPOSITE MATERIAL

摘要

Provided are a prepreg that is excellent in adhesiveness between carbon fibers and a matrix resin and long-term storage stability and achieves both excellent impact resistance and electrical conductivity in the thickness direction and a carbon fiber reinforced composite material. The present invention provides a prepreg formed by impregnating sizing agent-coated carbon fibers coated with a sizing agent containing an aliphatic epoxy compound (A) and an aromatic epoxy compound (B1) with a thermosetting resin composition containing thermoplastic resin particles (F) and conductive particles (G) in a mass ratio of 1:1 to 1,000 or conductive particles (H) in which a thermoplastic resin is covered with a conductive substance. An (a)/(b) ratio is within a predetermined range where (a) is a height of a component at a binding energy assigned to CHx, C-C, and C=C and (b) is a height of a component at a binding energy assigned to C-O in a C 1s core spectrum of surfaces of the sizing agent-coated carbon fibers analyzed by X-ray photoelectron spectroscopy.