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Temperature behavior of the Kohlrausch exponent for a series of vinylic polymers modelled by an all-atomistic approach

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Abstract

The Kohlrausch-Williams-Watt (KWW) function, or stretched exponential function, is usually employed to reveal the time dependence of the polymer backbone relaxation process, the so-called α relaxation, at different temperatures. In order to gain insight into polymer dynamics at temperatures higher than the glass transition temperature T g , the behavior of the Kohlrausch exponent, which is a component of the KWW function, is studied for a series of vinylic polymers, using an all-atomistic simulation approach. Our data show very good agreement with published experimental results and can be described by existing phenomenological models. The Kohlrausch exponent exhibits a linear dependence with temperature until it reaches a constant value of 0.44, at 1.26T g , revealing the existence of two regimes. These results suggest that, as the temperature increases, the dynamics progressively change until it reaches a plateau. The non-exponential character then describes subdiffusive motion characteristic of polymer melts.

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Authors and Affiliations

  1. Département de Chimie, Université de Sherbrooke, 2500 boul. de l’Université, Sherbrooke, Québec, Canada

    S. Palato, N. Metatla & A. Soldera

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  1. S. Palato
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  2. N. Metatla
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  3. A. Soldera
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Correspondence to A. Soldera.

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Palato, S., Metatla, N. & Soldera, A. Temperature behavior of the Kohlrausch exponent for a series of vinylic polymers modelled by an all-atomistic approach. Eur. Phys. J. E 34, 90 (2011). https://doi.org/10.1140/epje/i2011-11090-y

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  • DOI: https://doi.org/10.1140/epje/i2011-11090-y

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