Nonisothermal Conductivity of Poly(N-vinylcarbazole)-based Na₁₃-2,9,16,23-Tetramethylamine, Tetracyclohexane Tetrazaporphyrin Composites

Abstract

Nonisothermal conductivity of poly(N-vinylcarbazole)(PVK)-based Na₁₃-2,9,16,23-tetramethylamine, tetracyclohexane, tetrazaporphyrin composites, varying their additive composition from 50 up to 100 percent (w/w), have been studied. The additive has an ionic character in water solution and a thermal induced paramagnetic state at temperatures higher than 70°C, which improves conductivity in the solid state with respect to its diamagnetic state at lower temperatures. A conductivity peak between 30 and 60°C was detected. It was due to additive-PVK interactions. A sigmoid curve on a plot of lnσ vs. 1/T indicates that an electrical conductivity transition in which a restructurization of ions assisted by the field and temperature took place. Before and after this transition the linearity of the curves is indicative of a thermally activated process for the mechanism of conductivity. The average activation energy, Ea, was in the interval 1.05–1.14 eV.

Keywords:

• composites
• d.c.-electrical conductivity
• poly(N-vinylcarbazole)
• PVK
• PVK-based composites
• polisodium-porphyrin