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Thermally Stimulated Relaxation and Electrical Conduction Phenomena In Polyacrylamide

Journal: International Journal of Engineering Research (Vol.2, No. 2)

Publication Date:

Authors : ;

Page : 92-94

Keywords : Thermally stimulated relaxation; luminescence; Electrical conductivity; Differential Scanning Calorimetry;

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Abstract

Thermally stimulated relaxation (TSR), employing thermally stimulated luminescence (TSL) and thermally stimulated conductivity (TSC) as experimental techniques, in Polyacrylamide (PAA) have been studied; in the temperature range 300 - 480 K. Measurements of electrical conductivity (?) at various temperatures, in the same temperature range have been made, in both as-grown and UV-irradiated PAA films; to elucidate the mechanism of charge transport in relation to the macromolecular relaxations in PAA. Two TSL and TSC glow curves with maxima at 375 and 475 K have been observed. The log? vs 1/T plots showed two transition temperatures with changes in slopes; indicating the on-set of molecular motion in PAA. The TSL/TSC curves at 475 K are attributed to the ?- relaxation near the glass transition temperature of the polymer. The ?-relaxation is considered to be associated with the glow curve at 375 K. Analysis of TSL / TSC curves and electrical conductivity plots have been made and the results are correlated. The two endothermic peaks recorded by Differential scanning calorimetry (DSC) are correlated with the TSL/TSC ? and ? - relaxations in Polyacrylamide.

Last modified: 2013-04-03 20:03:10