AbstractDielectric relaxation data is reported on a series of elastomers formed between bisphenolAand either polyethylene glycol or polypropylene glycol. The observed dispersion may be ascribed to relaxation of the “soft” block and is found to vary with both change in the glycol block length and with the ratio of bisphenolAto polyglycol. Elastomers prepared with a poly‐glycol component of mixed composition allowed the relaxation frequency at a particular temperature to be shifted over a frequency range of almost three decades. Activation parameters obtained from the temperature dependence of the mean relaxation frequency are used in evaluation of the factors influencing the molecular motion of the “soft
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