Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-01-23
Physics
Condensed Matter
Soft Condensed Matter
10 pages 7 figures
Scientific paper
10.1080/14786430600936413
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).
Casalini R.
Roland Michael C.
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