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IJPAP Vol.45(11) [November 2007] >

Title: Electrical conduction behaviour of pristine and 100 MeV Ni ion irradiated PET/0.8PHB polymer liquid crystals
Authors: Quamara, J K
Sridharbabu, Y
Goyal, Geetika
Sharma, Anu
Keywords: Liquid crystals
Electrical conduction
Issue Date: Nov-2007
Publisher: CSIR
IPC CodeC30B
Abstract: Electrical conduction behaviour of pristine and 100 MeV Ni ion irradiated terephthalate (PET)/0.8 poly(p-hydroxy-benzoic acid) (PHB) polymer liquid crystals has been investigated in transient and steady state conditions at different electric fields (13-104.3 kV/cm) and temperatures (40-250ºC). The various mechanisms responsible for charge transport phenomena can be thoroughly investigated by studying temperature and field dependent conduction behaviour. The origin of transient currents in polymers has been ascribed to number of mechanisms. The dipolar relaxation seems to be the major contributor to these currents at lower temperatures. The temporal decay of current may be due to trapping of charge carriers and/or due to the reduction of electric field owing to the formation of Schottky layers in the vicinity of the electrodes. The high temperature relaxations do not contribute much to the transient behaviour. The transient currents in ion irradiated samples are mainly governed by cross-link structures and free radical formation in addition to the δ-transition. Poole-Frenkel and Schottky conduction mechanisms appear to operate at high and low temperature regions, respectively, for both pristine and irradiated samples.
Page(s): 910-919
ISSN: 0019-5596
Source:IJPAP Vol.45(11) [November 2007]

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