symtheses of new carbonaceous mesophase pitch using HF/BF_3

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Preparation, structure, properties and a variety of application of mesophase pitches from aromatic hydrocarbons were examined to clarify their unique natures in the carbon science and technology. It was found HF/BF_3 catalyst oligomerizes a variety of aromatic hydrocarbons into oligomeras ranging dimers to decamers, which carries naphthenic hydrogens produced through aryl-reflecting their starting structure and polymerization conditions. For example, softening points of 100% anisotropic pitch range from 210 to 300ﾟC. The mesophase pitches showes excellent carbon yields of 80-90% under atmospheric pressure and over 90% under 3.1 MPa. High reactivity for oxidation in the air and thermal stability under inert atmosphere are additional advantage of the present pitch. Such properties allow a number of their applications for the carbon fiber, carbon tape, composites, high density carbon, porous carbon composite and carbon ceramic composite.