Thermally stimulated depolarization current studies of sulfonated polystyrene ionomers |
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Authors: | Antonio José Felix Carvalho Vicente Galber Freitas Viana and Roberto Mendon?a Faria |
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Institution: | (1) Centro de Biomateriales e Ingenier?a Tisular, Universidad Polit?cnica de Valencia, Cam? de Vera, 14, 46022 Valencia, Spain;(2) Department of Physics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece;(3) Departament de F?sica, Universitat Jaume I, 12071 Castell?, Spain;(4) CIBER en Bioingenier?a, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain;(5) Centro de Investigaci?n Pr?ncipe Felipe, Autopista del Saler 16, 46013 Valencia, Spain |
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Abstract: | A detailed study of thermally stimulated depolarization current (TSDC) was carried out to investigate dipolar relaxation and
the charge storage phenomenon in films of sulfonated polystyrene (SPS) ionomers having lithium or potassium as counterions.
Differential scanning calorimetry measurements were also applied as a complementary technique, mainly to follow the change
of the glass transition temperature with the amount of sulfonated groups. It was observed that, since the glass transition
does not change significantly with the amount of sulfonated groups, a cluster of multiplets is expected not to be formed in
the range used in this work. TSDC of SPS samples polarized at temperatures higher than the glass transition temperature showed
three peaks: one at lower temperature (peak β), an intermediate peak (peak α), and a third that appeared at a temperature coincident with the polarization temperature (peak ρ). Quantitative information about trapping–detrapping and dipolar relaxation and their corresponding activation energies was
determined by fittings of the deconvoluted peaks with kinetic relaxation processes. |
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