Abstract
Three lengths for the dynamic glass transition will be compared: akinematic length from computer simulation, a heterogeneity lengthfrom multidimensional nuclear magnetic resonance, and a characteristic length fromcalorimetry. A qualitatively consistent picture is obtained afterdiscussion of their different origins. The difficulties withrespect to measured and simulated lengths are exposed. Heatcapacity spectroscopy data for temperatures and frequencies near andabove the crossover region of the dynamic glass transition are reportedfor two substances: poly(n-decyl methacrylate), PnDMA, and6-(4-benzyl oxy phenyl)-1, 2, 3, 4 tetraphenyl fulvene, TPCP-BO.
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