Abstract
Thermal conductivity of polyethylene (PE) filled with carbon black (CB) was measured as a function of temperature. Thermal conductivity decreased linearly with temperature in the scope of our study, where temperature coefficints of thermal conductivity were independent of CB weight fraction (Wf) and density of PE. Thermal conductivity increased linearly with density of PE with a coefficient which was independent of Wf below Wf=0.5, although the coefficient decreased significantly with Wf above Wf=0.5 because of mixing of air into sample films. Thermal conductivity was represented as a quadratic function of Wf when temperature and density of PE were constant. Summarizing above results, an empirical formula of thermal conductivity was derived as functions of temperature, density of PE and Wf.
