Abstract
Experimental results are presented on isothermal and nonisothermal electric current measurements obtained with a polystyrene and disperse red 1 guest–host system containing different percentages of the dye. The superposition principle holds for isothermal measurements and polarization currents seem to be almost independent of temperature in the range from 30 to 70 °C, below the glass transition temperature Tg. Thermally stimulated depolarization (TSD) current measurements show that the polarization induced in the samples depends strongly on poling conditions. Samples poled at temperatures above Tg have a lower polarization than those poled just below Tg. If the poling temperature Tp is far below Tg, the TSD current peak appears at much higher temperatures than Tp. The TSD curves differ somewhat from corresponding curves obtained during linear heating under applied voltage.
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