Abstract
The absorption of ultrasonic waves over the frequency range of 10 kHz to 110 MHz was measured for solutions of polystyrene in xylene. The samples were anion-polymerized, atactic polystyrenes with three different molecular weights. Both the strength and frequency of the low-frequency relaxation occuring between 10 and 100 kHz were found to depend on the molecular weight and were ascribed to heat-transfer between the polymer sphere (a polymer chain with included solvent) and the surrounding solvent. Spectra of the high-frequency relaxations observed at frequencies from 1 to 100 MHz were found to be independent of molecular weight and decomposed into two single relaxations. The high-frequency relaxation is concluded to arise from the volume change accompanying an internal rotation of a backbone segment consisting of a few monomeric units. The splitting into two mechanisms is interpreted on the basis of the tacticity of atactic polystyrene. The ultrahigh-frequency relaxation around 500 MHz which is discerned by replotting the data by Mikhailov and Safina is attributed to the relaxation of vibrational specific heat of the phenyl groups.
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Ono, K., Shintani, H., Yano, O. et al. Absorption of 10-MHz to 110-MHz Ultrasonic Waves by Solutions of Polystyrene. Polym J 5, 164–175 (1973). https://doi.org/10.1295/polymj.5.164
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DOI: https://doi.org/10.1295/polymj.5.164
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