71.アルゴンヌ炭の軟化溶融に伴う芳香環構造の変化

抄録

The structural changes, especially the size of aromatic cluster, of three Argonne coal samples during their plastic range were analyzed by using solid state ^<13>C NMR spectroscopy. Before analysis, the coals were heat treated at Gieseler plastometry related temperatures for each coal. The resulting char residue were submitted to the NMR measurement with two methods: single pulse excitation for getting quantitative spectra, and dipolar dephasing method. The size of aromatic ring size in coal and char samples was evaluated, the results showing that it increased with the heat treatment temperature for each coal, however, its growth behavior clearly depended on the coal type.