Journal of Thermal Analysis and Calorimetry

, Volume 127, Issue 3, pp 1975–1981 | Cite as

The impact of the stretching exponent on fragility of glass-forming liquids

Article
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Abstract

The paper compared two factors governing fragility. The first one is thermodynamic, depending on the change in configurational entropy. The second one is kinetic and is determined by the stretching exponent β. Using a simple mathematical development, we show that the kinetic term \(m_{\text{K}} = f( {\beta_{{T_{\text{g}} }} } )\partial \ln \beta \left( T \right)/\partial \ln T|_{{T = T_{\text{g}} }}\) is always smaller than 1, where T g is the glass transition temperature and \(f( {\beta_{{T_{\text{g}} }} } )\) is the given functions of the stretching exponent at T = T g. As a result, the contribution of the kinetic term on the fragility of strong glasses is <6 %. Fragile glasses have a larger value of fragility index m, and for them, the influence of the kinetic term is significantly smaller. In any case, the thermodynamic term plays the main role in fragility and the kinetic one can be neglected.

Keywords

Kinetic fragility Configurational entropy Stretching exponent 
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Notes

Acknowledgements

This work has been carried out with the financial support of the Serbian Ministry of Science and Technological Development, within the projects Nos III 45021 and 172059. Special thanks are due to Dr. Dušan Petković for his useful comments.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2016

Authors and Affiliations

  1. 1.Faculty of Technical SciencesUniversity of Novi SadNovi SadSerbia

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