The effect of pressure on the dynamics of supercooled liquids shows a variety of remarkable similarities for different glass-forming systems. However, an important group of liquids, characterized by hydrogen-bond interactions, show some deviations from these general behaviors. To investigate this, we use broadband dielectric spectroscopy to study the temperature dependent dynamics of a supercooled hydrogen bonded oligomeric glycol and its non-hydrogen-bonded analog over a wide range of pressures. With the chosen model system, we are able to directly link the presence of hydrogen bonding to deviations from the general pattern of the pressure response of supercooled dynamics.
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