Glass transitions and enthalpy relaxation in coals

A.J. Mackinnon, M.M. Antxustegi, P.J. Hall

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Differential scanning calorimetry was used to investigate the glass-to-rubber transition at 383 K of Illinois No. 6 coal dried at 383 K and thermally treated to 523 K. The intensity of the transition is 0.2 Jg−1 K−1, similar in magnitude to that for polypyrrole and polystyrene. The temperatures of the glass transitions in the coal and the polymers are also very similar. It is concluded that the glass transition of the coal represents a significant change in structure. Annealing experiments were conducted on the coal at temperatures just below the glass transition. Enthalpy relaxation occurred after thermal treatment to 553 K.
Original languageEnglish
Pages (from-to)113-115
Number of pages2
Issue number1
Publication statusPublished - Jan 1994


  • macromolecular structure
  • differential scanning calorimetry
  • coal


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