Abstract
The d.c.-electrical conductivity studies have been done in poly(vinylidene fluoride) (PVDF), poly(methylmethacrylate) (PMMA) and their polyblends in the entire composition range as a function of voltage and temperature. Some studies on thickness and electrode dependence of the electrical conductivity were also carried out. The results obtained show that the charge carriers are generated by Richardson-Schottky emission from the electrode as well as from trapped ionic impurities at high fields and are conducted through the bulk of the material by a carrier hopping process. The values of Schottky field lowering constant βRS, the Poole-Frenkel trap lowering constant βPF, the effective metal insulator potential barrier, the ionic jump distance and the activation energy involved in the conduction process are reported. A.c.-conductivity values were calculated from a.c.-dielectric data and the results show the evidence of hopping conduction in the bulk of polyblends.
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