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Issue 12, 2008
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Characteristic relaxation times and their invariance to thermodynamic conditions

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Abstract

The dynamics of molecular liquids and polymers exhibit various “transitions”, associated with characteristic changes in properties. With decreasing temperature or increasing pressure, these transitions include (i) the onset of intermolecular cooperativity with consequent non-Arrhenius and non-Debye behavior; (ii) the dynamic crossover at which derivatives of the relaxation time and strength exhibit breaks; (iii) vitrification, corresponding to cessation of translational and rotational motions; and (iv) for anisotropic molecules the development of liquid crystallinity. At each of these transitions of a liquid, the structural or reorientational relaxation time is constant, independent of thermodynamic conditions; that is, while the temperature of the transition depends on pressure, the relaxation does not.

Graphical abstract: Characteristic relaxation times and their invariance to thermodynamic conditions

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Article information


First published
09 Sep 2008

Soft Matter, 2008,4, 2316-2322
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Characteristic relaxation times and their invariance to thermodynamic conditions

C. M. Roland, Soft Matter, 2008, 4, 2316
DOI: 10.1039/B804794D

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