A kind of carbon-based composites with both high heat conductivity and absorption capacity

With the rapid increase in power density of electronics, the demands for high-performance thermal management materials have become more and more urgent. The good performance of both heat transfer and adsorption is simultaneously required to control the temperature of electronic at a reasonable level. Herein, intermediate phase asphalt-based short carbon fibers (SCFs) and paraffin (Pa) are incorporated into polyolefin elastomer (POE) matrix to construct highly thermally conductive phase change composites (PCCs). Through a series of steps such as melt blending, hot-pressing, and cutting, the obtained L1-30 wt. % (600 μm)/P1E1 PCC exhibits a through-plane thermal conductivity of 10.43 W m−1 K−1 and good heat absorption capacity. Moreover, the molecular network of POE matrix and SCFs skeleton are proved to be effectively prevent the phase change materials from leakage. In a thermal management test, the prepared PCC presents a temperature decline of 17.8 °C than that of the naked heater. This work gives a perspective to fabricate thermally conductive PCCs with oriented fillers as well as to find potential application in the thermal management of electronics.