AC CONDUCTIVITY AND DIELECTRIC STUDY OF THE POLYESTER REINFORCED BY AL/CNT:ZN/AL NANOCOMPOSITE
In this study, composites of carbon nanotubes and zinc matrix have been fabricated by a powder metallurgy method. Firstly, CNT and Zn powders with sizes in the range of (4.5-6.7) nm, respectivel are dispersed at various weight contents (in the range of (2.0% -.1.0 %) in polyester polymer as solvent to get (polyester /CNT-Zn) Nano composite of about 2 mm thickness. The effects of different multi-walled carbon nanotubes (CNTs) contents on the ac conductivity and dielectric properties of the composites were investigated. Ac conductivity measurements of multi-walled carbon nanotubes (CNTs) reinforced polyester have been evaluated. AC conductivity was examined in the frequency range from (100-400k) Hz at ambient temperature.An enhancement of Ac-conductivity, in accordance to percolation theory, was evidenced increasing the weight content of the conductive Nano-filler .The experimental results indicate that the frequency dependent behavior of CNT-Zn /polyester Nano composite can be modeled by R-C circuit, permittivity of material increase with increasing of CNT content. .Also, the results showed that the addition to the zinc matrix of 1% by volume of carbon nanotubes caused increases in the ac conductivity.
Keywords: A.C Conductivity, NanComposite Polymer, Dielectric Constant.