Abstract
DSC was used to study the characteristic endotherm which occurs when reheating a glass back to the liquid state. Anionic polystyrene, PMMA, polycarbonate, and polysulfone were tested, varying both the cooling and reheating rates over two decades. In this initial paper on these results, an experimental technique optimized for glassy polymers is explained, and the proper method for correcting thermal lag is outlined. The variation of the onset, peak and fictive temperatures is shown for polystyrene and polysulfone. Results are also reported for the first time on the shift of the endothermal glass transition, measured while cooling.
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