Elastic properties and equation of state for polycarbonate by high-pressure Brillouin spectroscopy

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

“…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.…”