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|Title:||Field-induced thermally stimulated currents in poly (p-phenylene sulphide)|
|Authors:||Quamara, J K|
|Abstract:||Thermally stimulated polarization currents (TSPC) have been investigated in poly p-phenylene sulphide (PPS) in temperature region 30-250°C under various polarization fields, ranging from 3 to 18kV/cm and with different heating rates. The effect of high temperature annealing on TSPC behaviour has also been investigated. The TSPC spectra show the presence of a single peak (P1) around 110°C. This peak has been attributed to a weak polar nature of C-S linkage. A phenomenal rise of several order of magnitudes in the current dominated by conduction current is observed above 170oC. During the successive cooling the current retains its positive polarity and in the 2nd TSPC cycle the peak P1 disappears due to temperature dependence of saturation polarization confirming the polar nature of this peak. The kinks observed in the TSPC spectra of annealed samples and with slow heating rates around 170°C are due to the dipolar relaxation process associated with ether linkage, a cross-linked structure formed due to high temperature annealing. The thermal variation in dielectric constant, deduced from TSPC spectra is in good agreement at low temperature, with the result obtained by other method.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.39(09) [September 2001]|
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