| 摘要 |
A carbon fiber composite material having an elastomer and vapor-grown carbon fibers dispersed in the elastomer. The vapor-grown carbon fibers are rigid fibers having an average diameter of 20 to 200 nm, an average length of 5 to 20 micrometers, and an average value of bending indices defined by the following expression (1) of 5 to 15, Bending index=Lx/D (1) Lx: length of linear portion of the vapor-grown carbon fiber, and D: diameter of the vapor-grown carbon fiber. The carbon fiber composite material has a dynamic modulus of elasticity (E') at 150° C. of 30 MPa or more and an elongation at break (EB) of 140% or more.
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