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Effect of infrared pulsated laser on the dielectric properties of polycarbonate

Makrofol-De polycarbonate is a class of polymeric solid state nuclear track detector which has many applications in various industrial fields. A study of the modification possibility of the dielectric properties of a Makrofol polymer using laser irradiation has been carried out. In the present work, Makrofol samples were irradiated using different fluences between 0.47 and 10.4 J/cm2 of 5 W infrared laser. The modifications in the laser irradiated Makrofol samples have been studied as a function of fluence using dielectric constant ϵ′, dielectric loss ϵ″, and AC conductivity σAC measurements. The frequency dependencies (100 Hz–5 MHz) of ϵ′, ϵ″ and σAC at 35 °C were investigated. The dielectric constant ϵ′, dielectric loss ϵ″ and AC conductivity σAC were also found to increase on heating up to 100 °C. The results indicate that ϵ′, ϵ″ and σAC depend not only on the frequency and temperature but also on the laser fluence.