Ultrasonic and hypersonic relaxation data are reported for a polymeric liquid oligobutene at frequencies between 51 kHz and 8 GHz in the temperature range from -60 to 100 °C. It is found that the superposition principle holds up to 0.76 GHz for shear data, while for the bulk process spectral narrowing takes place around 3 GHz. This difference can be interpreted in terms of a local theory presented by one of the authors.
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Kōno et al. (1982) studied this question.
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