PHYSICAL STUDY ON POLY (ETHYLENE OXIDE)

COMPOSITES DISPERSEDWITH ALUM PARTICLES

AND DOPED WITH CARBON BLACK NANOPARTICLES

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ABSTRACT

 The present thesis contains investigation of the optical,electrical, and thermal properties of thin films made of poly (ethylene oxide) dispersed with dopants of alum concentrations (0, 2, 4, 8 , 12 and 16  wt%), and fixed amount of carbon black (0.1 wt%). The prepared films by casting method have been optically investigated as a function of the alum and carbon black fillers, and UV-visible wavelength ranges from 300 to 800 nm. The absorption coefficient, energy gap, refractive index, extinction coefficient, dielectric constants, and optical conductivity have been determined. The results obtained showed that the optical constants change with increasing the alum concentration and built in carbon black complexes.

AC electrical properties were studied using the AC impedance technique. The observed values of the impedance, dielectric constant, dielectric loss, and  AC-conductivity showed frequency, temperature, and alum concentrations dependence. It was found that the dielectric constant and dielectric loss of the prepared thin films increase with increasing the alum concentration and decreasing frequency according to polarization processes.

     The thermal conductivity of the prepared PEO thin films doped with alum and carbon black composites have been studied at different alum concentrations and temperatures. It was found that the thermal conductivity increases with temperature and alum content. The Wiedemann-Franz law was used to determine the Lorenz constant which relates the electrical and thermal conductivities

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