采用熔融共混与模压成型方式制备了聚乙烯（PE）/氮化硼（BN）/废旧橡胶粉末（WRP）复合材料。WRP具有三维网络结构，可在加工过程中维持其稳定结构，迫使BN选择性分散在PE基体中形成隔离导热网络，从而提升复合材料的导热性能。在BN质量分数为30%、PE与WRP质量比为1/2 时，与未添加WRP的PE/BN 复合材料相比，PE/BN/WRP复合材料的导热系数提高了37.3%，达到了1.73 W/(m· K)，是纯PE 的4.33 倍；冲击强度提高了55.4%，达到了8.3 kJ/m2。利用脱硫胶粉制备高导热性能复合材料为废弃硫化橡胶的高值化和功能化利用提供了新思路。
Polyethylene(PE)/boron nitride (BN)/ devulcanized waste rubber powder (WRP) composites were prepared by melt blending and compression molding. In the blending, the three- dimensional network structure of WRP can maintain its initial structure during mechanical processing. BN platelets disperse in the PE matrix to form thermally conductive segregated network, which improves the thermal conductivity of the composites. When the BN mass fraction is 30% and mass ratio of PE to WRP is 1/2, the thermal conductivity of the PE/BN/WRP composite is 1.73 W/(m × K). Compared with the PE/BN composite, the thermal conductivity of the PE/BN/WRP composite is increased by 37.3%, which is 4.33 times that of pure PE. The impact strength is 8.3 kJ/m2, which is 55.4% higher than that of the PE/BN composite. This study used devulcanized WRP to prepare the high thermally conductive composite, which provides a new idea for the high-value and functional utilization of waste vulcanized rubber.