CARBON FIBER AND ITS PRODUCTION

摘要

PURPOSE:To remarkably improve adhesive strength of a composite and further improve high order processability of carbon fiber and tensile strength of composite. CONSTITUTION:This carbon fiber is constituted by sizing a carbon fiber whose surface oxygen concentration O/C measured by an X ray photoelectric spectroscopy is <=0.20 and whose surface hydroxyl group concentration C-OH/C and surface carboxyl group concentration C-OH/C measured by chemically modified X ray photoelectric spectroscopy and surface nitrogen concentration N/C of carbon fiber measured by X ray photoelectric spectroscopy are each in a specific range with an aliphatic compound having plural epoxy groups or an aromatic compound having plural epoxy groups having >=6 number of atoms between the epoxy group and the aromatic ring. Furthermore, a method for producing this carbon fiber is provided.