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Relation between the dispersion of α-relaxation and the time scale of β-relaxation at the glass transition

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Title: Relation between the dispersion of α-relaxation and the time scale of β-relaxation at the glass transition
Authors: Capaccioli, Simone1,2 capacci@df.unipi.it, Prevosto, Daniele1,3, Kessairi, Khadra1,3, Lucchesi, Mauro1,3, Rolla, Pierangelo1,3
Source: Journal of Non-Crystalline Solids. Nov2007, Vol. 353 Issue 41-43, p3984-3988. 5p.
Subjects: Dielectrics, Glass transition temperature, Oligomers, Glass
Abstract: 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–Goldstein β-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. [Copyright &y& Elsevier]
Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 26682256
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Relation between the dispersion of α-relaxation and the time scale of β-relaxation at the glass transition
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. Nov2007, Vol. 353 Issue 41-43, p3984-3988. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Dielectrics%22">Dielectrics</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Oligomers%22">Oligomers</searchLink><br /><searchLink fieldCode="DE" term="%22Glass%22">Glass</searchLink>
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  Label: Abstract
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  Data: 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–Goldstein β-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. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jnoncrysol.2007.07.007
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 5
        StartPage: 3984
    Subjects:
      – SubjectFull: Dielectrics
        Type: general
      – SubjectFull: Glass transition temperature
        Type: general
      – SubjectFull: Oligomers
        Type: general
      – SubjectFull: Glass
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      – TitleFull: Relation between the dispersion of α-relaxation and the time scale of β-relaxation at the glass transition
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            NameFull: Prevosto, Daniele
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            NameFull: Kessairi, Khadra
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            NameFull: Lucchesi, Mauro
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            – D: 01
              M: 11
              Text: Nov2007
              Type: published
              Y: 2007
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              Value: 353
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              Value: 41-43
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