Abstract
Preparing thermal conductive polymeric composites under a premise of low filler content is currently a research hotspot. In this work, boron nitride (BN) with different geometries was used to enhance the thermal conductivity (TC) of a polymer, for the purpose of fabricating advanced polymeric thermal conductors. The effect of filler content and hybrid geometric structure on the properties of composites was investigated. When the proportion of hexagonal BN (h-BN) and spherical BN (s-BN) in the composite was 7:3, the TC of the sample was the highest, which reached 0.88 W/(m·K) and 3.49 W/(m·K) for 20 and 50 wt % overall loadings of BN, respectively. Moreover, the results of X-ray diffraction and numerical simulation analysis also confirmed that the effect on exfoliation would be significantly enhanced by loading hybrid geometric fillers, resulting in producing more BN sheets consisting of thermal paths. The obtained results provided a new explanation for the interaction of hybrid geometric fillers in complex flow fields and a new solution for the fabrication of advanced thermal management materials.
Published Version
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