Chemistry and structure of coal derived asphaltenes and preasphaltenes. Quarterly progress report, October-December 1980. [Methyl-o-xylene; methyl anthracene; methyl naphthalene; methyl pyrene; methyl phenyl ether]

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Six model compounds of low molecular weight polymers or oligomers of benzene, o-xylene, anthracene, naphthalene, pyrene, and diphenyl ether were synthesized to study the separate effects of ring number, aliphatic substitution and ether oxygen on pyrolysis yield and microstructure. The results of the experiments on the model compounds were not as expected and hard to explain. The polyphenyl and methyl-o-xylene formed fine and coarse mesophases respectively. Methyl naphthalene and methyl anthracene both formed fine isotropic mesophases. Methyl pyrene and methyl phenyl ether did not melt and formed disordered chars. The polyphenyl, although pyridine insoluble, has no oxygen to suppress mesophase ... continued below

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Pages: 16

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Yen, T.F. January 1, 1980.

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Description

Six model compounds of low molecular weight polymers or oligomers of benzene, o-xylene, anthracene, naphthalene, pyrene, and diphenyl ether were synthesized to study the separate effects of ring number, aliphatic substitution and ether oxygen on pyrolysis yield and microstructure. The results of the experiments on the model compounds were not as expected and hard to explain. The polyphenyl and methyl-o-xylene formed fine and coarse mesophases respectively. Methyl naphthalene and methyl anthracene both formed fine isotropic mesophases. Methyl pyrene and methyl phenyl ether did not melt and formed disordered chars. The polyphenyl, although pyridine insoluble, has no oxygen to suppress mesophase growth. The methy-o-xylene is a template for mesophase formation. During pyrolysis, the methyl groups must react together to form the large, flat aromatic sheets. That the methyl naphthalene and methyl anthracene formed an isotropic structure is surprising. It was expected that these would form at least a coarse deformed mesophase like polyphenyl. The methyl pyrene contained some oxygen and was insoluble in pyridine so could already have been cross-linked in the precursor. Methyl phenyl ether also was pyridine insoluble and was possibly a cross-linked precursor as well.

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Pages: 16

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NTIS, PC A02/MF A01.

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  • Other: DE82002152
  • Report No.: DOE/ET/10626-T2
  • Report No.: FE-2031-19
  • Grant Number: AC22-75ET10626
  • DOI: 10.2172/5618936 | External Link
  • Office of Scientific & Technical Information Report Number: 5618936
  • Archival Resource Key: ark:/67531/metadc1092639

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  • January 1, 1980

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 22, 2018, 2:20 p.m.

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Yen, T.F. Chemistry and structure of coal derived asphaltenes and preasphaltenes. Quarterly progress report, October-December 1980. [Methyl-o-xylene; methyl anthracene; methyl naphthalene; methyl pyrene; methyl phenyl ether], report, January 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1092639/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.