Dispersion Structure of BN in LLDPE/POE Blends and Its Influences on Thermally Conductivity of Composites
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.
PolyolefinBoron nitrideThermal conductivityFinite element simulation
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