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  • 1 CSIRO Division of Coal and Energy Technology PO Box 136 2113 North Ryde NSW Australia
  • 2 CSIRO Division of Wool Technology Geelong Laboratory PO Box 21 3216 Belmont Victoria Australia
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Abstract  

Thermomechanical analysis (TMA) in a tube-compressive mode can be used to characterize pitch in a reproducible and sensitive way. In a single experiment, this technique enables simultaneous determination of the glass transition temperature, the softening temperature and the rheological behaviour of a pitch sample. Results on a typical Australian coal-tar pitch are consistent with Bingham fluid behaviour above its softening temperature with a yield stress of the order of 100 Pa. In a similar test a petroleum pitch sample exhibited no yield stress.

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