Abstract
Ultrasonic relaxation data are reported on solutions of polystyrene in toluene, dioxan, m-xylene and p-xylene over a frequency range of 1–1000 MHz and a temperature range of 293–353K. The data are analysed in terms of two components, a viscoelastic contribution associated with the normal mode relaxations and a more local conformational change of the polymer backbone. The solvent, molecular weight and temperature dependence of the relaxation processes are discussed. An anomalous increase in the amplitude of the acoustic absorption at high temperatures is ascribed to the occurrence of a pseudo helix-coil transition. A picture of the dynamic processes now emerges which rationalizes the apparently disparate earlier studies into a coherent self-consistent description.
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