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Effect of temperature and volume on structural relaxation time: Interpretation in terms of decrease of configurational entropy

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Title: Effect of temperature and volume on structural relaxation time: Interpretation in terms of decrease of configurational entropy
Authors: Prevosto, Daniele1,2 prevosto@df.unipi.it, Capaccioli, Simone1,2, Lucchesi, Mauro1, Rolla, Pierangelo1
Source: Journal of Non-Crystalline Solids. Sep2005, Vol. 351 Issue 33-36, p2611-2615. 5p.
Subjects: Ergodic theory, Information theory, Thermodynamics, Glass transition temperature
Abstract: Abstract: We analyze the slowing down of structural relaxation dynamics of two small molecular glass formers and one polymer: o-terphenyl, triphenylchloromethane, and poly(methylmethacrylate). Considering the literature data of expansivity and heat capacity we calculate configurational entropy using a previously proposed relation between the configurational and the excess entropy, and we directly check the Adam and Gibbs theory for glass transition. In particular, we clearly show that using such expression for configurational entropy the predicted linear dependence between the logarithmic of structural relaxation time and the product of temperature with configurational entropy is well satisfied and it does not depend on pressure. Moreover, we also derive an equation for calculating the pressure dependence of the glass transition temperature, which in these systems is in good accordance with the experimental values. [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.)
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DbLabel: Engineering Source
An: 18264405
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  Data: Effect of temperature and volume on structural relaxation time: Interpretation in terms of decrease of configurational entropy
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  Data: <searchLink fieldCode="AR" term="%22Prevosto%2C+Daniele%22">Prevosto, Daniele</searchLink><relatesTo>1,2</relatesTo><i> prevosto@df.unipi.it</i><br /><searchLink fieldCode="AR" term="%22Capaccioli%2C+Simone%22">Capaccioli, Simone</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lucchesi%2C+Mauro%22">Lucchesi, Mauro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rolla%2C+Pierangelo%22">Rolla, Pierangelo</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. Sep2005, Vol. 351 Issue 33-36, p2611-2615. 5p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Ergodic+theory%22">Ergodic theory</searchLink><br /><searchLink fieldCode="DE" term="%22Information+theory%22">Information theory</searchLink><br /><searchLink fieldCode="DE" term="%22Thermodynamics%22">Thermodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: We analyze the slowing down of structural relaxation dynamics of two small molecular glass formers and one polymer: o-terphenyl, triphenylchloromethane, and poly(methylmethacrylate). Considering the literature data of expansivity and heat capacity we calculate configurational entropy using a previously proposed relation between the configurational and the excess entropy, and we directly check the Adam and Gibbs theory for glass transition. In particular, we clearly show that using such expression for configurational entropy the predicted linear dependence between the logarithmic of structural relaxation time and the product of temperature with configurational entropy is well satisfied and it does not depend on pressure. Moreover, we also derive an equation for calculating the pressure dependence of the glass transition temperature, which in these systems is in good accordance with the experimental values. [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.2005.03.057
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 2611
    Subjects:
      – SubjectFull: Ergodic theory
        Type: general
      – SubjectFull: Information theory
        Type: general
      – SubjectFull: Thermodynamics
        Type: general
      – SubjectFull: Glass transition temperature
        Type: general
    Titles:
      – TitleFull: Effect of temperature and volume on structural relaxation time: Interpretation in terms of decrease of configurational entropy
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            NameFull: Prevosto, Daniele
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            NameFull: Capaccioli, Simone
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            NameFull: Lucchesi, Mauro
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            – D: 15
              M: 09
              Text: Sep2005
              Type: published
              Y: 2005
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              Value: 351
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              Value: 33-36
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            – TitleFull: Journal of Non-Crystalline Solids
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