Pressure dependence of acoustic behaviors and refractive index of amorphous Kel F-800 copolymer studied by Brillouin spectroscopy

High-pressure elasticity of poly(methyl methacrylate) up to 31.5 GPa studied by Brillouin spectroscopy

“…(4) in order to derive the density. It was found that the polarizability of the repeat unit of Kel F-800 copolymer does not change within the experimental uncertainty over a wide pressure range from 0.1 MPa to 13 GPa [5]. The pressure dependence of density of Kel F-800 was successfully obtained based on this assumption, and the results were consistent with previous report [4].…”

Pressure Dependence of Acoustic Properties of Liquid Ethanol by using High-pressure Brillouin Spectroscopy

“…Recently, Kim et al successfully developed a high-pressure Brillouin spectrometer and applied this technique to some amorphous materials. [30,31] The purpose of this study is to report the detailed optical configuration of the high-pressure Brillouin spectrometer set up at Hallym University, to describe the concrete experimental procedure in more detail, and to discuss the experimental results of acoustic properties of liquid ethanol under high pressure obtained by using this spectrometer. This paper will be a complementary work to our previous report on the high-pressure Brillouin spectroscopy.…”

Hydrostaticity of poly(methyl methacrylate) loaded in a diamond anvil cell for high-pressure study

“…On the other hand, if polymeric materials are to be investigated, they may be put into the gasket hole without any pressure medium. This method has been used to measure the EOS of several polymeric materials up to a few tens of GPa [6][7][8][9][10][11][12], for example, ~85 GPa for the Kel F-800 copolymer by using Brillouin scattering spectroscopy [9]. However, a recent Brillouin scattering study on polycarbonate seems to indicate that the condition of hydrostatic pressure may be seriously broken for the polymer once it is included in the DAC without any pressure medium [13].…”

“…The EOS of polymers relates the density to the pressure. The EOS can be derived from the sound velocity, which can be calculated from the Brillouin frequency shift [6][7][8][9][10][11][12][13]. Since the Brillouin frequency shift is the only necessary information for the calculation of EOS, the same Brillouin shift under different M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 4 experimental conditions guarantees the same EOS of the materials loaded in DAC.…”