| abstract |
PROBLEM TO BE SOLVED: To obtain a carbon fiber composed of an aggregate of filamentary carbon nanofibers and a carbon nanofiber obtained from the carbon fiber, and to provide this aggregate with high quality from an industrial technical viewpoint. And to provide the technology to produce with the yield. SOLUTION: A carbon fiber comprising an aggregate of filamentary carbon nanofibers and a carbon nanofiber obtained by pulverizing the carbon fibers. Further, a polymer blend fiber, which is a precursor fiber for obtaining the carbon fiber, The morphology of this fiber has a streaky phase separation structure along the fiber axis direction, and the fiber axis vertical section has a phase separation structure in which island-like independent phases are scattered in a matrix phase, The precursor fiber is mainly composed of a thermally decomposable polymer, and the main component of the island-shaped independent phase is composed of an acrylonitrile-based polymer. |