Carbonization Properties of Aromatic Hydrocarbons Containing Five-membered Ring

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Abstract
The carbonization properties of aromatic hydrocarbons containing five-membered ring were examined under various conditions to resolve the relation of the properties with the chemical structure, and to investigate the effects of conditions on the features of the mesophase which was formed at the earlier stage of carbonization.The carbonization reactivity decreased in the order of acenaphthylene >> decacyclene > truxene > acenaphthene > fluoranthene≅fluorene.The first three of the hydrocarbons were carbonized at 600°C when the rate of temperature increase was programed to be 150°C/hr.Acenaphthene which was not carbonized under these conditions required a rapid temperature increase of 600°C/hr to give a needle coke.All these hydrocarbons gave needle cokes by the aid of aluminum chloride.The different conditions of carbonization gave different features of the mesophase.Acenaphthylene provided huge spheres and flower petals of anisotropic mesophase under rapid temperature increase (600°C/hr) and refluxing carbonization conditions, respectively.

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