An Analysis Study of The Effect of Concentration of Carbon Black on The Electrical Conductivity of Unsaturated Polyester

Carbon black (BP-2000) play an important affect in improvement the electrical conductivity of unsaturated polyester. We added different weight percentage of carbon black (10, 15, 20, and 30 wt%) to polyester in order to obtain composite. Practical measurements were shown that increasing this additive material to polymer led to increase electrical conductivity from (4.7×10-10 ohm-1cm-1 ) for pure polymer to (5.1×10-4 ohm-1cm-1 ) for polymer +30wt%carbon black. Also, we concluded that the activation energy in pure polymer has two value in two temperature regions; 0.15ev in (300 -360)K and 0.6ev in (360-425)K, while in composite for all weight percentage of BP, there is only one value of activation energy about(0.11-0.15) ev in (300-410)K. Estimated theoretical equation is sigmoid function was achieved by making fitting curve for all practical data using (Table Curve 2D, version 5.01) software. This help us to estimate mathematical model for the shape behavior of (conductivity- temperature) curve, and to find any value of electrical conductivity for any weight percentage that is not taken experimentally.