| abstract |
An intermediate for composite material molding which comprises carbon fibers and a resin composition containing a benzoxazine compound having, in the molecule, structural units I represented by the following structural formula (I), each of the carbon fibers having a sectional shape which is substantially truly circular; and a fiber-reinforced composite material obtained from the intermediate. (I) (In the formula, R1 is C1-12 chain alkyl, C3-8 cycloalkyl, phenyl, or phenyl substituted by C1-12 chain alkyl or a halogen; and the aromatic ring has a hydrogen atom bonded to at least one of the carbon atoms in the positions ortho and para to the carbon atom bonded to the oxygen atom.) The intermediate retains a high level of adhesion between the carbon fibers and the resin even in a high-humidity high-temperature atmosphere. It hence gives a fiber-reinforced composite material having excellent weatherability and a high degree of mechanical strength. |