| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a prepreg for composite materials providing a carbon fiber-reinforced composite material using benzoxazine as a matrix resin and not only having high tensile strength in non-fiber direction, but also excellent in compressive strength after impact, and a carbon fiber-reinforced material obtained from the prepreg. <P>SOLUTION: The prepreg for composite materials comprises [A] reinforcing fiber composed of a carbon fiber, [B] an epoxy resin and [C] a benzoxazine compound having a structural unit (I) represented by the general formula (R<SB>1</SB>is a 1-12C chain alkyl group, a 3-8C cyclic alkyl group, phenyl group or a phenyl group substituted with a 1-12C chain alkyl group or a halogen and hydrogen is bonded to at least either one carbon atom of carbon atoms in ortho position and para position of carbon atom to which oxygen atom of an aromatic ring is bonded). In the prepreg for composite materials, critical strain energy releasing ratio G<SB>IIC</SB>of a composite material obtained by curing the prepreg for composite materials is≥1.0 kJ/m<SP>2</SP>. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
