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 TVgG, where T is temperature, V specific volume, and gG the thermodynamic Gruneisen parameter. A similar scaling is known for structural relaxation times,tau = f(TVg); however, we find gG < 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, S0, yielding the relationship tau = f(S-S0).
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