On the derivation of equilibrium relaxation times from aging experiments

Ranko Richert; Peter Lunkenheimer; Stefan Kastner; Alois Loidl

doi:10.1021/jp311149n

On the derivation of equilibrium relaxation times from aging experiments

Ranko Richert, Peter Lunkenheimer, Stefan Kastner, Alois Loidl

Molecular Sciences, School of (SMS)

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Physical aging below the glass transition temperature, T_g, is generally understood to be governed by the same slow degrees of freedom that are responsible for structural relaxation in the equilibrium state above T _g. Provided a reliable model of aging is at hand, it should thus be possible to extract very long relaxation time constants from experimental data on physical aging. Two very different models of aging are investigated in this respect using data for various molecular glass-forming liquids extending out to aging times of 3 × 10⁶ s. It turns out that application of the well-known KAHR or TNM model does not provide a significant advantage over a recently proposed phenomenological approach that is much simpler.

Original language	English (US)
Pages (from-to)	12689-12694
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	117
Issue number	42
DOIs	https://doi.org/10.1021/jp311149n
State	Published - Oct 24 2013

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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N2 - Physical aging below the glass transition temperature, Tg, is generally understood to be governed by the same slow degrees of freedom that are responsible for structural relaxation in the equilibrium state above T g. Provided a reliable model of aging is at hand, it should thus be possible to extract very long relaxation time constants from experimental data on physical aging. Two very different models of aging are investigated in this respect using data for various molecular glass-forming liquids extending out to aging times of 3 × 106 s. It turns out that application of the well-known KAHR or TNM model does not provide a significant advantage over a recently proposed phenomenological approach that is much simpler.

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On the derivation of equilibrium relaxation times from aging experiments

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