Pressure coefficient of the glass transition temperature in the thermodynamic scaling regime

We report that the pressure coefficient of the glass transition temperature, dT _g/dp, which is commonly used to determine the pressure sensitivity of the glass transition temperature T _g, can be predicted in the thermodynamic scaling regime. We show that the equation derived from the isochronal condition combined with the well-known scaling, TVγ = const, predicts successfully values of dT _g/dp for a variety of glass-forming systems, including van der Waals liquids, polymers, and ionic liquids.