PREPREG AND CARBON FIBER REINFORCED MATERIAL

Provided is a prepreg for providing a carbon fiber reinforced material having excellent Mode I interlaminar toughness and Mode II interlaminar toughness and the carbon fiber reinforced material, the prepreg including the following constituents [A] to [C], the prepreg satisfying the following conditions [I] to [III]:[A]: a sizing agent-coated carbon fiber;[B]: an epoxy resin having a specific structure; and[C]: a hardener for [B],[I]: an epoxy resin composition including the constituents [B] and [C] has a nematic-isotropic phase transition temperature in a temperature range of 130°C to 180°C;[II] a prepreg after isothermal holding at 100°C for 30 minutes does not have a high-order structure originated from a diffraction angle of 2θ = 1.0° to 6.0° measured by wide angle X-ray diffraction at 100°C; and[III]: a prepreg after isothermal holding at 180°C for 2 hours has a high-order structure originated from the diffraction angle of 2θ = 1.0° to 6.0° measured by wide angle X-ray diffraction at 180°C.