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Journal of Materials Science

, Volume 29, Issue 7, pp 1966–1972 | Cite as

Diels-Alder reaction of mesophase pitch insoluble fractions with maleic anhydride

  • H. Toshima
  • T. Hino
  • K. Murakami
  • I. Mochida
Papers
  • 72 Downloads

Abstract

Pyridine insoluble fractions in the mesophase pitches derived from a decant oil (PMP-PI) and naphthalene (NMP-PI) were found to be rendered almost completely soluble in pyridine by the Diels-Alder reaction with maleic anhydride, maintaining their optical anisotropy and molecular association. Their solubility in pyridine reached up to 95 wt % by the reaction at 175–200 °C. Solubilized fractions were analysed to obtain their average structures, suggesting that PMP-PI consists of aromatic nuclei of peri-condensed rings connected through a small number of methylene and aryl-aryl linkages, having a molecular weight (MW) of ∼ 1800, and that NMP-PI consists of oligomeric naphthalene with a large number of naphthenic groups (MW ≃ 1000). Such structures are basically much the same as those of their soluble fractions, although the molecules in Pls were much larger. The reaction sites in such structures for the Diels-Alder reaction are discussed.

Keywords

Polymer Molecular Weight Anisotropy Pyridine Anhydride 
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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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • H. Toshima
    • 1
  • T. Hino
    • 1
  • K. Murakami
    • 1
  • I. Mochida
    • 2
  1. 1.Corporate Research and Development LaboratoryTonen Co. LtdSaitamaJapan
  2. 2.Institute of Advanced Material StudyKyushu UniversityFukuokaJapan

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