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Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition (Articolo in rivista)
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- Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Alternative label
Capaccioli, S; Prevosto, D; Kessairi, K; Lucchesi, M; Rolla, P (2007)
Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition
in Journal of non-crystalline solids
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- Capaccioli, S; Prevosto, D; Kessairi, K; Lucchesi, M; Rolla, P (literal)
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- ISI Web of Science (WOS) (literal)
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- Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; INFM, CNR, Polylab, I-56127 Pisa, Italy; INFM, CNR, CRS SOFT, Dipartimento Fis, I-00185 Rome, Italy (literal)
- Titolo
- Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition (literal)
- Abstract
- Dielectric spectra of several typical molecular glass-formers, showing one or more secondary processes resolved in the glassy state, have been measured at different temperatures. We found that the genuine Johari-Gold stein P-relaxation is connected to the structural relaxation. In fact, a clear correlation was found between the structural relaxation time, the Johari-Goldstein relaxation time and the dispersion of the structural relaxation (i.e. its Kohlrausch parameter). Moreover, for a group of epoxide oligomers the steepness index is correlated to the broadness of the structural peak and to the time separation between the structural and the Johari-Goldstein relaxation. These results support the idea that the Johari-Goldstein relaxation acts as a precursor of the structural relaxation. A rationale for our results is provided by the coupling model. (C) 2007 Elsevier B.V. All rights reserved. (literal)
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