The effect of acetylene black amount, operating pressure and temperature of capillary rheometer on thermal conductivity in natural rubber

ABSTRACT The effects of the amount of acetylene black on viscosity and thermal conductivity and the effects of operating pressure and temperature of capillary rheometer on thermal conductivity were investigated. Five different natural rubber compounds were prepared as 3NAB, 4NAB, 5NAB, 6NAB and 7NAB, which contain different amounts of acetylene black. Thermal conductivities were measured at different temperatures and pressures. The viscosity of the five compounds was measured and it was found that viscosity increases as the amount of acetylene black increases. Thermal conductivity measurements were performed at different temperatures and pressures by using a capillary rheometer. The obtained results indicated that thermal conductivity increased with the increasing acetylene black. The relationship between thermal conductivity-pressure and thermal conductivity-temperature have also been examined. Additionally, the mechanical properties, electrical conductivity, and thermal stability of the compounds were analysed. The change of these properties with the amount of acetylene black was examined.