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The solid-echo signal decays of 1H-NMR of four pitches were measured in-situ during the heat treatmentemploying proton-magnetic resonance thermal analysis (PMRTA). The pitches became mobile (long T2) in thetemperature region 400-700K. The mobility of coal tar pitch and Ashland 240 petroleum pitch, which exhibit sphericalmesophase and flow optical texture, was confirmed to be kept till 750K. On the other hand, aliphatic-and sulfur-richpetroleum pitches, which exhibit the mosaic optical texture, lost their mobility at temperature below 750K, indicatingthat they are thermally unstable. The thermal instability of these pitches could be due to their relatively high contentsof aliphatic groups and sulfur. The PMRTA pyrograms afford useful information about the mesophase formation.

In-situ Proton Magnetic Resonance Thermal Analysis for Mesophase Formation of Pitches