PROCESS FOR PRODUCING CARBON NANOFIBER, CARBON NANOFIBER, PROCESS FOR PRODUCING CARBON FIBER COMPOSITE MATERIAL FROM CARBON NANOFIBER, AND CARBON FIBER COMPOSITE MATERIAL

摘要

A method of producing carbon nanofibers includes grinding untreated carbon nanofibers produced by a vapor growth method. The untreated carbon nanofibers are ground so that the ground carbon nanofibers have a tap density 1.5 to 10 times higher than that of the untreated carbon nanofibers. A method of producing a carbon fiber composite material includes mixing carbon nanofibers 40 into an elastomer 30, and uniformly dispersing the carbon nanofibers 40 in the elastomer 30 by applying a shear force to obtain a carbon fiber composite material.