Abstract
The influence of oxidic filler grains on the pyrolysis behaviour of binder pitch was studied by thermogravimetric, chemical, polarisation and electron microscopic as well as by X-ray methods. It is shown that oxidic surfaces hinder the mesophase formation during heat treatment of pitch. Higher H/C ratios as well as diminished pyridine solubilities of the HT residues and higher coke yields are found in comparison with the pyrolysis behaviour of pure pitch. As the oxide type is less important than the amount of wetted surface area, all observed effects are explained by physical adsorption phenomena.
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