Abstract
Abstract The onset of thermally induced configurational fluctuations in a polymer near the glass transition can be monitored by the ensemble averaged isomerization reaction of probe molecules subject to a significant sterical hindrance. The decay patterns can be rationalized in terms of a distribution of activation barriers together with a temperature dependent correlation time for the matrix cages. Experimental support is given by data of a spiropyran/PBMA system investigated in the temperature range near Tg.
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