| 摘要 |
PURPOSE:To provide the titled prepreg having high tensile strength and heat resistance, and composed of a resin composition prepared by compounding more than a specific amount of a specific glycidyl compound as a matrix resin to a high-strength carbon fiber etc. giving an electrical current falling within a specific range when measured by an electrical potential scanning method. CONSTITUTION:The objective prepreg is obtained by mixing (A) a high-strength carbon fiber or graphite fiber giving an electrical current of 0.080-0.250muA/ cm<2> measured by the electrical potential scanning method (e.g. cyclic voltametry) using the carbon fiber as one of the electrodes, immersing the electrode in an electrolyte solution (e.g. aqueous solution of phosphoric acid, etc.) using a platinum electrode having sufficiently large surface area as the counter electrode and using an Ag/AgCl cell, with (B) >=40wt% 3- or 4-functional glycidyl compound (e.g. triglycidyl-m-aminophenol) as the matrix resin, and adding (C) a conventional curing catalyst (e.g. monoethylamine salt of boron trifluoride, etc.) to the obtained resin composition. USE:For aricraft, etc.
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