Effect of entropy on the dynamics of supercooled liquids: New results from high pressure data

Abstract

We show that for arbitrary thermodynamic conditions, master curves of the entropy are obtained by expressing S(T,V) as a function of TV^g_G, where T is temperature, V specific volume, and g_G the thermodynamic Gruneisen parameter. A similar scaling is known for structural relaxation times,tau = f(TV^g); however, we find g_G < g. We show herein that this inequality reflects contributions to S(T,V) from processes, such as vibrations and secondary relaxations, that do not directly influence the supercooled dynamics. An approximate method is proposed to remove these contributions, S_0, yielding the relationship tau = f(S-S_0).

10 pages 7 figures

References in corpus (1)

• Thermodynamic interpretation of the scaling of the dynamics of supercooled liquids

Cited by in corpus (3)

• An equation for the description of volume and temperature dependences of the dynamics of supercooled liquids and polymer melts
• Determination of the Thermodynamic Scaling Exponent from Static, Ambient-Pressure Quantities
• Equation of State and Entropy Theory Approach to Thermodynamic Scaling in Polymeric Glass-Forming Liquids