Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-03-20
Physics
Condensed Matter
Soft Condensed Matter
to be published in the special edition of J. Non-Crystalline Solids honoring K.L. Ngai
Scientific paper
10.1016/j.jnoncrysol.2007.03.026
A recently proposed expression to describe the temperature and volume dependences of the structural (or alpha) relaxation time is discussed. This equation satisfies the scaling law for the relaxation times, tau = f(TV^g), where T is temperature, V the specific volume, and g a material-dependent constant. The expression for the function f is shown to accurately fit experimental data for several glass-forming liquids and polymers over an extended range encompassing the dynamic crossover, providing a description of the dynamics with a minimal number of parameters. The results herein can be reconciled with previously found correlations of the isochoric fragility with both the isobaric fragility at atmospheric pressure and the scaling exponent g.
Casalini R.
Roland Michael C.
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