Journal of Thermal Analysis and Calorimetry

, Volume 111, Issue 1, pp 773–779 | Cite as

Slow molecular mobility in the amorphous thermoplastic polysulfone

A TSDC investigation
Article

Abstract

The thermally stimulated depolarization current (TSDC) technique has been used to study the slow molecular mobility of polysulfone in the glassy state and in the glass transformation region, i.e., in the temperature ranging from −155 to 183 °C. Since the polysulfone is a rigid polymer without polar side-groups, a broad and low-intensity secondary relaxation was detected in the temperature region from −120 °C up to the glass transition; the activation energy of the motional modes of this secondary relaxation is in the range between 35 and 100 kJ mol−1. The glass transition temperature of polysulfone provided by the TSDC technique is T M = T g = 176 °C (at 4 °C min−1). The relaxation time at this temperature is τ(T g) = 33 s and the fragility index was found to be m = 91. Our results are compared with literature values obtained by dynamic mechanical analysis and by dielectric relaxation spectroscopy. The amorphous polysulfone was also characterized by DSC; a glass transition signal with an onset at T on = 185.5 ± 0.3 °C (heating rate 10 °C min−1) was detected, with ΔC p = 0.21 ± 0.01 J g−1 °C−1.

Keywords

TSDC Thermally stimulated currents Amorphous polymer Glass transition Secondary relaxations Fragility 

Notes

Acknowledgements

This work was supported in partially by Fundação para a Ciência e a Tecnologia (FCT), Portugal (Project PEst-OE/QUI/UI0100/2011).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  1. 1.Centro de Química Estrutural, Instituto Superior TécnicoUniversidade Técnica de LisboaLisbonPortugal
  2. 2.Centro de Química-Física Molecular (CQFM) and Institute of Nanoscience and Nanotechnology (IN), Instituto Superior TécnicoUniversidade Técnica de LisboaLisbonPortugal

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