Abstract:

A series of heat conductive and insulating foams were prepared by melt blending using low?density polyethylene (PE-LD), maleic anhydride-grafted polyethylene (PE-g-MAH) and boron nitride (h-BN) as raw materials. The effects of PE-g-MAH and h-BN on the thermal conductivity, insulation, mechanical properties and thermal stability of PE-LD/PE-g-MAH/h-BN foams were investigated. The result indicated that the foams achieved an improvement in elongation at break and tensile strength, and their thermal conductivity was also enhanced significantly due to the strong interaction between PE-LD and h-BN bridged by PE-g-MAH. The foams gained a thermal conductivity of 0.256 W/（m·K） at the h-BN content of 30 wt%, and their thermal conductivity increased by 118 % and 657 % compared to PE-LD/h-BN foam and pure PE-LD foam, respectively. Moreover, the PE-LD/PE-g-MAH /h-BN foams obtained good insulation and thermal stability.

Key words: low density polyethylene, boron nitride, heat conductive, mechanical property, foam