A prominent shoulder exhibited in the shear retardation spectrum of a high molecular weight polystyrene enables the local segmental contribution to the recoverable compliance to be isolated and determined for the first time. The prominence of this shoulder depends on the time/frequency window of the viscoelastic measurements. This interesting dependence is explained by the thermorheological complexity of the glass−rubber softening dispersion.
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Ngai et al. (1996) studied this question.
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