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To monitor the dynamical changes in coals with temperature, an in-situ method must be used, therefore, we have applied Single-Point-Imaging and have carried out the first systematic in-situ variable-temperature NMR imaging study of coals between 25 and 500°C with our newly developed high temperature imaging probe and systems. It was found that the distribution of mobile components was very heterogeneous...
The viscoelastic properties of coals in the thermoplastic phase during carbonization were measured with dynamic mechanical oscillation instrumentation. The temperature and frequency dependence of the viscoelastic properties of the coals in the thermoplastic phase were similar to those of polymers and thermosetting resins. The storage modulus (G′) and the loss modulus (G″) showed minimum (104–105Pa),...
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