| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing a carbon fiber, by which the carbon fiber not having a difference between the structures of inner and outer layers and having a high tensile strength and a high tensile elastic modulus can simply be produced. <P>SOLUTION: The method for producing the carbon fiber comprises preparing a spinning dope comprising a polyacrylonitrile-based polymer and carbon nanotubes dispersed in the polyacrylonitrile-based polymer, spinning and drawing the spinning dope to produce a carbon fiber precursor, and then subjecting the precursor to a fire-resisting treatment and a carbonization treatment. In the method. the fire-resisting treatment is performed by irradiating the carbon fiber precursor with energy rays. The carbon fiber is characterized in that Ro/Ri is 0.5-2.0, wherein Ro and Ri are the G/D ratios of the outermost layer and innermost layer of the fiber, respectively, determined with Raman spectrum. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
