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The glass transition

Finite size effect

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Abstract

The subjects of the paper are the mechanism of vitrification and the glass transition, and a definition of the temperature of the glass transition. A comprehensive description of the structural changes occurring in the amorphous phase (‘real’ and ‘semi-ordered’) in a vicinity of the glass transition is presented. One of the major motivation of our studies is to investigate the finite size effect of the glass transition that could be related to the cooperative motion in supercooled liquids. Also, new formula, describing the relaxation time temperature change, is applied in order to better reveal themechanismof the supermolecular formation under different internal and external factors. The results of the basic methods of thermal analysis, obtained for different polymeric systems, were used in this study. The proposed approach let us correlate the thermodynamic and the structural parameters, which are estimated from the experiments, and describe all well known shapes of the DSC traces, which can be recorded in the glass transition region. Based on positron annihilation lifetime spectroscopy and dilatometric results, the significance of the free and the specific volumes for the activation of the relaxing units is discussed.

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  1. Uniwersytet Śląski, Instytut Fizyki, Katowice, Poland, 40-007, Uniwersytecka 4

    Danch A.

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  1. Danch A.
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Danch, A. The glass transition. J Therm Anal Calorim 84, 663–668 (2006). https://doi.org/10.1007/s10973-005-7163-0

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  • DOI: https://doi.org/10.1007/s10973-005-7163-0

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