The recently discovered scaling law for the relaxation times, , where is temperature and the specific volume, is derived by a revision of the entropy model of the glass transition dynamics originally proposed by Avramov [J. Non-Cryst. Solids 262, 258 (2000)]. In this modification the entropy is calculated by an alternative route. The resulting expression for the variation of the relaxation time with and is shown to accurately fit experimental data for several glass-forming liquids and polymers over an extended range encompassing the dynamic crossover. From this analysis, which is valid for any model in which the relaxation time is a function of the entropy, we find that the scaling exponent can be identified with the Grüneisen constant.
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7 July 2006
Research Article|
July 06 2006
Thermodynamic interpretation of the scaling of the dynamics of supercooled liquids Available to Purchase
R. Casalini;
R. Casalini
a)
Naval Research Laboratory
, Chemistry Division, Washington DC 20375-5342 and Chemistry Department, George Mason University
, Fairfax Virginia 22030
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U. Mohanty;
U. Mohanty
b)
Department of Chemistry,
Boston College
, Newton, Massachusetts 02467
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C. M. Roland
C. M. Roland
c)
Naval Research Laboratory
, Chemistry Division, Washington DC 20375-5342
Search for other works by this author on:
R. Casalini
a)
Naval Research Laboratory
, Chemistry Division, Washington DC 20375-5342 and Chemistry Department, George Mason University
, Fairfax Virginia 22030
U. Mohanty
b)
Department of Chemistry,
Boston College
, Newton, Massachusetts 02467
C. M. Roland
c)
Naval Research Laboratory
, Chemistry Division, Washington DC 20375-5342a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
c)
Electronic mail: [email protected]
J. Chem. Phys. 125, 014505 (2006)
Article history
Received:
September 30 2005
Accepted:
April 27 2006
Citation
R. Casalini, U. Mohanty, C. M. Roland; Thermodynamic interpretation of the scaling of the dynamics of supercooled liquids. J. Chem. Phys. 7 July 2006; 125 (1): 014505. https://doi.org/10.1063/1.2206582
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