Abstract
The anisotropic development is studied of mesophase pitches prepared from modified ethylene tar (ETP) using AlCl3, of fractions separated by benzene, tetrahydrofuran (THF) and pyridine, and of mixed fractions, to find structural factors affecting fusibility and optical anisotropy of mesophase pitch. Annealing was carried out at 360° C for 10 min. Each fraction developed a unique optical anisotropy quite different from that of the parent mesophase pitch. The lightest fraction (soluble in benzene) was highly fusible with small numbers of small anisotropic spheres. The heaviest fraction (insoluble in pyridine) was infusible and exhibited a total mosaic anisotropy. In contrast, mixed fractions behaved like the parent mesophase pitch in terms of liquid crystal behaviour. The extent of anisotropy and fusibility after annealing were strongly dependent on the preparatory conditions of the parent mesophase pitch. The fusibility of mixed fractions is ascribed to the dissolving ability of the fusible fraction and the solubility of the infusible fraction at the annealing temperature. Small molecules in the lighter fractions also contribute to anisotropy when they are located in interlayer positions between the larger aromatic molecules which constitute liquid crystals. Such co-operative properties of constituent molecules of the mesophase pitch can be described in terms of a practical compatibility.
Similar content being viewed by others
References
S. Otani, Carbon 3 (1965) 31.
L. S. Singer, Fuel 60 (1981) 839.
R. J. Diefendorf and D. M. Riggs, British Patent Application GB 2005024A (1978).
S. Chwastiak, British Patent Application GB 2005298A (1979).
Y. Yamada and H. Honda, Japanese Patent 58-18421 (1981).
W. C. Stevens, G. S. Scherr and R. J. Diefendorf, Extended Abstracts of 14th American Carbon Conference, Pennsylvania, June 1979 (American Carbon Society, 1979) p. 348.
S. H. Chen, W. C. Stevens and R. J. Diefendorf, Abstracts of International Symposium on Carbon, Toyohashi, November 1982 (Japanese Carbon Society, 1982) p. 46.
S. H. Chen and R. J. Diefendorf, Extended Abstracts of 16th American Carbon Centre Conference, San Diego, July 1983 (American Carbon Society, 1983) p. 28.
I. Mochida and Y. Korai, Preprints for meeting of the American Chemical Society, St. Louis, March 1984, Vol. 29, No. 2, p. 355.
Idem, Carbon in press.
I. Mochida, Y. Sone and Y. Korai, ibid. in press.
Y. D. Park, A. Oya and S. Otani, Fuel 62 (1983) 700.
Idem, ibid. 62 (1983) 1499.
I. Mochida, K. Amamoto, K. Maeda and K. Takeshita, ibid. 56 (1977) 49.
Idem, ibid. 57 (1978) 225.
H. Marsh, I. Macefield and J. Smith, Extended Abstracts of 13th American Carbon Conference, Irvine, July 1977 (American Carbon Society, 1977) p. 21.
Y. Korai and I. Mochida, Fuel 62 (1983) 893.
J. K. Brown and W. R. Ladner, ibid. 39 (1960) 79.
A. Kikuchi, S. Otani and A. Ota, Abstracts of Conference on Chemistry, Tokyo, April 1981, Vol. 2 (Chemical Society of Japan) p. 1227.
S. Otani, Japanese Patent 57-100186 (1982).
B. Rand and S. Whitehouse, Extended Abstracts of 16th American Carbon Conference, San Diego, July 1983 (American Carbon Society, 1983) p. 30.
I. Mochida and K. Maeda, J. Mater. Sci. 18 (1983) 3736.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mochida, I., Sone, Y., Park, Y.D. et al. Interaction among fractions in mesophase pitches derived from AlCl3-modified ethylene tar. J Mater Sci 20, 3177–3183 (1985). https://doi.org/10.1007/BF00545183
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00545183