Abstract
In the present study, shear modulus, refractive index, and dynamic density of the order of GHz frequency were evaluated by measuring Brillouin scattering light under high pressure, employing a diamond-anvil high-pressure cell and a laser light scattering optical system improved on the previous one. The sound velocity on transverse mode and shear modulus were obtained for polyphenylether up to 4 GPa. The slope change in pressure-sound velocity diagram was confirmed at about 0.3 GPa. The change of refractive index became small with pressure and reached to a constant value at 3 GPa for both polyalphaorefine and tar naphthenic oil. The dynamic density was obtained from Brillouin scattering for several synthetic oils. The density change by pressure for naphthenic oils and polyphenylether was a half smaller than static one and its difference decreased with raising temperature. Application of a viscoelastic model with a bulk viscosity for these features was attempted.
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