Investigation of the effect of gamma rays on electrical properties of chlorinated poly (vinyl chloride) |
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Authors: | S. A. Nouh A. S. Abdel-Naby |
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Affiliation: | 1. Physics Department , Ain Shams University , Cairo , Egypt;2. Chemistry Department, Faculty of Science , Cairo University , Fayoum , Egypt |
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Abstract: | Dielectric constant, dielectric loss and AC conductivity were measured, in the frequency range 100 Hz to 5 MHz in chlorinated poly (vinyl chloride) (CPVC) before and after exposure to gamma irradiation at doses between 5.0 KGy and 50.0 KGy. The frequency dependencies of ε′, ε″ and σAC at 30 °C were investigated. A relaxation peak in the dielectric loss and a corresponding step in the dielectric constant have been observed, in the frequency ranges 103 Hz to 104 Hz. The dielectric constant ε′, dielectric loss ε″ and AC conductivity σAC are also found to increase at heating up to 100 °C. In addition the effect of gamma irradiation on the frequency dependencies of ε′, ε″ and σAC was measured at room temperature. The gamma irradiation leads to an increase in the efficiency of soft segments. Furthermore, the DC electrical conductivity of both the irradiated and non-irradiated samples was investigated. The induced electrical conductivity and the activation energy were measured, at various temperatures, as a function of gamma dose. It was found that the gamma radiation has a definite effect on the DC conductivity of the CPVC polymer. |
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Keywords: | Radiation Effects Gamma Rays Dielectric Properties Dc Conductivity And Polymers |
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