Carbon fiber bundle and its manufacturing method, prepreg and carbon fiber reinforced composite material

摘要

Crystallite size LC (nm), the single fiber compressive strength FC (GPA) measured by the compression fragmentation method of a single fiber composite and the initial elastic modulus E0 (GPA) in the resin impregnation strand tensile test simultaneously combined with the following equations (1) to Carbon fiber bundles whose LC is 4.00 nm or less:FC ≧ 1.3 x 10 / lc-0.3E0. Leq. 80 * LC + 155. (2)E0 ≧ 330The present invention provides a carbon fiber bundle having tensile modulus and compressive strength of an excellent carbon fiber reinforced composite material and its manufacturing method.