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Thermally Stimulated Current spectroscopy for the study of thermoplastics

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Abstract

Relaxation phenomena in polycarbonate have been explored by Thermally Stimulated Current (TSC) spectroscopy. A comparative study of transitions by differential scanning calorimetry has also been undertaken. In the sub-T g region, the observed relaxations have been associated with the diffusion of local defects along the chains. In the glass transition region, the annealing induces the segregation of two relaxation modes: the lower temperature component associated with the unstressed amorphous phase, the higher temperature component attributed to stressed amorphous phase responsible for the modules observed in electron microscopy and X-ray diffraction.

Zusammenfassung

RelaxationsphÄnomene von abgeschrecktem und getempertem Polycarbonat (Lextan) wurden mit Thermisch Stimulierten Feldpolarisations Spektroskopie [Thermally Stimulated Current (TSC) Spectroscopy] untersucht. Unterhalb der Glasumwandlung wird eine Relaxation beobachtet, die mit einem molekularen Kettenmechanismus in Zusammenhang gebracht wird. Temperung verursacht eine Trennung in eine spannungsfreie und eine unter Belastung durch die Kristalle stehende amorphe Phase. Experimentelle Befunde werden diskutiert und Modellbetrachtungen zur dielektrischen Relaxation vorgestellt.

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Authors and Affiliations

  1. Solid State Physics Laboratory, Paul Sabatier University, Toulouse, France

    A. Bernes, J. J. Martinez, D. Chatain & C. Lacabanne

Authors
  1. A. Bernes
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  2. J. J. Martinez
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  3. D. Chatain
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  4. C. Lacabanne
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Bernes, A., Martinez, J.J., Chatain, D. et al. Thermally Stimulated Current spectroscopy for the study of thermoplastics. Journal of Thermal Analysis 37, 1795–1804 (1991). https://doi.org/10.1007/BF01912211

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