Acoustic Properties of Polymers in High Pressure Studied by Brillouin Spectroscopy
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Polymers are many kinds and used in various fields depending on their type. therefore, it is important to study the state of the polymer in temperature and high pressure conditions, so that it can be used in various fields. In this study, Polycarbonate(PC), Poly methyl methacrylate(PMMA) and Polystyrene, which are widely used polymers, were investigated by Brillouin spectroscopy at high pressure condition. Especially, it has been proved that PMMA has the same behavior when pressure is applied to only PMMA and in liquid and the Poisson ratio of molecular weight was calculated by measuring the acoustic phonon of polystyrene with different molecular weight.