Abstract
AbstractRelaxation processes in the soft segment phase of a block copoly(ether‐ester) elastomer were investigated using the spin probe method. Rotational mobility of the two probes, differing in sizes, were analysed and the results were interpreted based on the relaxation diagram. It was found that the change in mobility of the probes, as detected by the change in ESR line shape, in the slow rotation region corresponds to the β‐relaxation, whereas that in the rapid rotation region corresponds to the α + β‐relaxation. The analysis of probe mobilities, including the way they rotate, indicates the necessity of inclusion of rotational anisotropy in the interpretation of the behaviour of probes of different size.
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