Preparation and properties of SiC/LLDPE thermal conductivity composites

The β-silicon carbide/linear low density polyethylene (SiC/LLDPE) thermal conductivity composites are prepared via the powder mixing-compression moulded method. The effects of content of SiC and NDZ-105 on the mechanical and thermal conductivity properties of composites are investigated. Results reveals that the thermal conductivity property of the composites are improved with the increasing volume fraction of SiC, and the thermal conductivity coefficient A comes up to 0.8233 W/(m·K) with 30.4% volume fraction of SiC, being over 2 times of that of native LLDPE. However, the tensile strength of composites decreases sharply with the increasing of SiC. For given SiC loading, the surface modification of SiC results in SiC/LLDPE composites' significantly enhanced thermal conductivity and mechanical properties, and the properties of composites are optimal with 3%(wt) of NDZ-105. The fracture of LLDPE changes from ductile fracture to brittle fracture, and SiC has a certain influence on the melting temperature and crystallinity of LLDPE matrix.