Influence of hydrogen bonding on the elastic properties of molecular glassforming liquids under high pressure

We present ultrasonic study of bulk modulus of liquid glycerol and propylene carbonate (PC) at room temperature under high pressure up to 0.6 and 1 GPa, respectively. Pressure dependence of the isothermal bulk modulus, recalculated from the ultrasonic adiabatic data, is almost linear for the both liquids with relatively similar slopes, in spite of the initial value of bulk modulus being twice higher for glycerol due to the presence of the hydrogen bonds. The values of pressure derivative (7.8 for glycerol and 8.6 for PC) indicate that the intermolecular interaction in the both liquids is close to the Lennard-Jones potential.