چكيده به لاتين
In recent decades, epoxy nanocomposites have gained a special importance in the electrical industry especially electrical, electronic and optoelectronic devices, due to their good electrical and mechanical properties. But the main disadvantage of epoxy, like other polymers, is that it has a poor thermal conductivity, which causes the heat produced in these devices not to be well transferred to the surrounding environment and affects their performance, reliability and lifetime. In this research, an attempt has been made to prepare epoxy-based nanocomposites that, in addition to being electrically insulating and having good mechanical properties, are economically viable and, of course, have acceptable thermal conductivity .The goal of this research was to prepare the epoxy- based nanocomposites with high thermal conductivity along with electrical insulation. For that, two fillers SiC (silicon carbide) and GNP (graphite nanoparticles) with different weight fractions were used. Thermal conductivity (DTC), electrical conductivity, dielectric breakdown voltage resistance and impact strength were analyzed to evaluate the properties of the prepared nanocomposites. FE-SEM analysis was also performed on the samples to observe the morphology of nanocomposites. It was found that adding 15% SiC and 0.3% GNP increased the epoxy thermal conductivity by 231%. The electrical conductivity test showed that all the samples remained in the range of electrical insulation. SiC and GNP fillers reduced breakdown voltage due to their low energy gap. Also, the impact strength of the samples was improved by applying 10% SiC filler and 0.3% GNP filler up to 414%.
