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Journal of Materials Science

, Volume 25, Issue 8, pp 3484–3492 | Cite as

Comparative evaluation of mesophase pitches derived from coal tar and FCC-DO

  • Isao Mochida
  • Hiroshi Toshima
  • Yozo Korai
  • Tibor Varga
Article

Abstract

Three kinds of mesophase pitches (MPs) derived from FCC-DO (P) and hydrogenated QI free coal tar (QIF) were comparatively evaluated in terms of their spinnability and stabilization reactivity based upon their structural characterizations. MP-P, which is meso-phase pitch from FCC-DO, preserved considerable amount of aliphatic and naphthenic hydrogens to show higher solubility, fusibility and softening temperature of as low as 245 °C in spite of its complete anisotropy. MP-C1 derived from catalytically hydrogenated QIF carried less hydrogen content and smaller molecular weight although its solubility and softening temperature were almost the same to those of MP-P. MP-C2 which was prepared from QIF treated with tetrahydro-quinoline (THQ) showed the least hydrogen content, the lowest solubility and the highest softening temperature of 290 °C. MP-P allowed smooth spinning for much longer time at the temperature from 320 to 350 °C. MP-C1 could be spun at the temperature from 340 to 370 °C, which was much higher than that of MP-P in spite of their similar softening temperatures. MP-C2 showed spinnability at the temperature from 340 to 390 °C, although evolved gases disturbed its smooth spinning at the higher temperature.

MP-P showed the highest stabilization reactivity to require the shortest time (120 min) for the sufficient stabilization at 250 °C. Although much longer time of 180 min was necessary for the MP-C1 at 250 °C, a higher temperature of 270 °C accelerated the stabilization reactions to shorten the time to 60 min. MP-C2 showed the least reactivity, requiring 120 min at 270 °C. More aliphatic and naphthenic structure of FCC-DO derived mesophase pitch is related to its superiority as the pitch fibre precursor. The catalytic hydrogenation which can produce naphthenic or aliphatic structure is a better pre-treatment to modify the coal tar as the mesophase pitch precursor.

Keywords

Hydrogen Content Small Molecular Weight Softening Temperature Sufficient Stabilization Fibre Precursor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    S. Otani, K. Okuda andH. S. Matsuda, “Carbon Fiber” (Kindai Henshusha, Tokyo, Japan, 1983) p. 231.Google Scholar
  2. 2.
    K. Kawata, S. Umekawa andK. Kobayashi, “Composites '86: Recent Advances in Japan and the United States” (Kokon Shoin Co. Ltd, Tokyo, Japan, 1986) p. 1.Google Scholar
  3. 3.
    S. Otani,Carbon 3 (1965) 31.Google Scholar
  4. 4.
    S. Otani,Mol. Cryst. Liq. Cryst. 63 (1981) 249.Google Scholar
  5. 5.
    S. Chwastiak, UK Patent Application GB2005298 A (1979).Google Scholar
  6. 6.
    D. Riggs andR. J. Diefendorf, U.S. Patent 4208267 (1980).Google Scholar
  7. 7.
    S. Otani andA. Oya, “Carbon Fibre Nyumon” (Omusha, Tokyo, Japan, 1983) p. 71.Google Scholar
  8. 8.
    I. Mochida andY. Korai,Kobunshi 35 (1986) 456.Google Scholar
  9. 9.
    T. Matsumoto,Pure & Appl. Chem. 57 (1985) 1553.Google Scholar
  10. 10.
    Y. Yamada, H. Honda andT. Inoue, Japan patent (Kokai) 58-18421.Google Scholar
  11. 11.
    Y. Korai, Y. Sone andI. Mochida, Extended Abstracts of 16th American Carbon Conference, San Diego, July 1983 (American Chemical Society Pennsylvania, USA, 1983) p. 96.Google Scholar
  12. 12.
    S. Chwastiak andI. C. Lewis,Carbon 16 (1978) 156.Google Scholar
  13. 13.
    L. S. Singer,Fuel 60 (1981) 839.Google Scholar
  14. 14.
    G. Dickakian, Extended Abstracts of 16th American Carbon Conference, San Diego, July 1983 (American Carbon Society Pennsylvania USA, 1983) p. 40.Google Scholar
  15. 15.
    B. Rand andS. Whitehouse,ibid p. 30.Google Scholar
  16. 16.
    J. K. Brown andW. R. Ladner,Fuel 39 (1960) 79.Google Scholar
  17. 17.
    I. Mochida, H. Toshima, Y. Korai andT. Matsumoto,J. Mater. Sci.,23 (1988) 670.Google Scholar
  18. 18.
    I. Mochida, H. Toshima, Y. Korai andT. Matsumoto,Chem. Lett. 11 (1987) 2279.Google Scholar
  19. 19.
    I. Mochida, H. Toshima, Y. Korai andT. Matsumoto,J. Mater. Sci.,24 (1989) 2191.Google Scholar
  20. 20.
    Y. Korai andL. Mochida,Carbon 23 (1985) 97.Google Scholar
  21. 21.
    Y. D. Park, Y. Korai andI. Mochida,J. Mater. Sci. 21 (1986) 424.Google Scholar
  22. 22.
    I. Mochida, H. Toshima, Y. Korai andT. Matsumoto,ibid. 23 (1988) 678.Google Scholar
  23. 23.
    A. Azuma, T. Tano, E. Kitajima andS. Kakuta, Extended Abstracts of 13th Annual Meeting, Japan Carbon Society, Tsukuba (1986) p. 14.Google Scholar
  24. 24.
    I. Mochida, Y. Korai, H. Fujitsu, T. Oyama andY. Nesumi,Carbon 25 (1987) 259.Google Scholar
  25. 25.
    I. Mochida, T. Oyama andY. Korai,ibid. 25 (1987) 273.Google Scholar
  26. 26.
    I. Mochida, T. Oyama, Y. Korai andY. Q. Fei,Oil & Gas Journal,86 (1988) 73.Google Scholar
  27. 27.
    I. Mochida, T. Oyama, Y. Korai andY. Q. Fei,Fuel, in press.Google Scholar
  28. 28.
    I. Mochida, Y. Q. Fei, T. Oyama, Y. Korai andH. Fujitsu,J. Mater. Sci.,22 (1987) 3989.Google Scholar
  29. 29.
    Y. Sanad andM. Yamane, Heavy Oil Division, Refining Section of The Japan Petroleum Institute,J. Japan Petrol. Inst. 24 (1981) 44.Google Scholar
  30. 30.
    E. M. Dickinson,Fuel 59 (1980) 290.Google Scholar
  31. 31.
    E. Hirsch,Anal. Chem. 42 (1970) 1326.Google Scholar
  32. 32.
    D. W. Van Krevelen andH. A. G. Chermin,Fuel 33 (1954) 79.Google Scholar
  33. 33.
    M. Shibata, K. Imamura, Y. Yamada, S. Arita andH. Honda, in Extended Abstracts of the 10th Annual Meeting of Japan Carbon Society (Tokyo, 1983) p. 22.Google Scholar
  34. 34.
    H. Honda,Tanso 126 (1986) 120.Google Scholar
  35. 35.
    I. Mochida, H. Toshima, Y. Korai andT. Matsumoto,J. Mater. Sci.,25 (1990) 76.Google Scholar
  36. 36.
    T. Kasu andH. Marsh, Extended Abstracts of the 12th Annual Meeting of Japan Carbon Society (Tokyo, 1985) p. 60.Google Scholar
  37. 37.
    P. C. Painter andM. M. Coleman,Fuel 58 (1979) 301.Google Scholar
  38. 38.
    P. C. Painter, Y. Yamada, R. G. Jenkins, M. M. Coleman andP. L. Walker Jr.,Fuel 58 (1979) 239.Google Scholar

Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • Isao Mochida
    • 1
  • Hiroshi Toshima
    • 1
  • Yozo Korai
    • 1
  • Tibor Varga
    • 2
  1. 1.Institute of Advanced Material StudyKyushu UniversityFukuokaJapan
  2. 2.Research Institute for Man-Made FibresSvitCzechoslovakia

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