Abstract
The acoustic properties of three polystyrene polymers with different molecular weights were investigated as a function of temperature by using Brillouin light scattering. The longitudinal sound velocity showed a change in the slope, which depended on the molecular weight, at the glass transition temperature. The absorption coefficient exhibited a maximum above the glass transition temperature, and the maximum temperature became higher as the molecular weight was increased. Comparison with previous acoustic studies on polystyrene indicate that a substantial frequency dispersion caused by strong coupling between the longitudinal acoustic waves and the segmental motions exists in the high-temperature range.
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Oh, S.H., Lee, B.W., Ko, JH. et al. Temperature and molecular-weight dependences of acoustic behaviors of polystyrene studied using Brillouin spectroscopy. Journal of the Korean Physical Society 70, 791–795 (2017). https://doi.org/10.3938/jkps.70.791
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DOI: https://doi.org/10.3938/jkps.70.791