以线型低密度聚乙烯（LLDPE）和聚烯烃弹性（POE）为聚烯烃材料，以氮化硼（BN）为导热填料，采用熔融共混热压法制备LLDPE/POE/BN导热复合材料，研究工艺方法对BN分散结构的影响，探讨复合材料结构与导热性能的关系，并结合有限元模拟预测了复合材料的导热系数和温度场的变化。结果表明：通过3种工艺方法获得了具有不同BN分散结构的复合材料。BN在LLDPE相中分散形成的共连续结构复合材料具有优异的导热性能。BN质量分数为40%和50%时，复合材料的导热系数分别为0.72 W/（m·K）和0.91 W/（m·K）。基于BN的分散结构构筑了复合材料的结构模型，成功预测了复合材料的导热系数，揭示了共连续结构的复合材料表现出更好的传热行为。

Using linear low-density polyethylene (LLDPE) and polyolefin elastomer (POE) as polyolefin materials and boron nitride (BN) as thermal conductivity filler, the LLDPE/POE/BN thermal conductivity composites was prepared by melt blending hot pressing method. The influence of the process on the dispersion structure of BN was studied, and the relationship between the structure and thermal conductivity of the composites was discussed. The thermal conductivity and temperature field of the composites were predicted by finite element simulation. The results show that the composites with different BN dispersion structures are obtained by three processes. The cocontinuous structure composites formed by BN dispersed in LLDPE phase has excellent thermal conductivity. When the mass fraction of BN is 40% and 50%, the thermal conductivity of the composites is 0.72 W/(m·K) and 0.91 W/(m·K), respectively. Based on the dispersion structure of BN, the structure model of the composites was constructed, the thermal conductivity of the composites was predicted successfully, and the better heat transfer behavior of the composites was revealed.