High Quasi-isotropic Thermal Conductivity of PDMS Composites with hexagonal-Boron Nitride Microspheres and Flakes
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초록
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Thermal interface materials (TIMs) have become increasingly critical to remove the heat for the longevity, performance, and reliability of electrical devices. Hexagonal-boron nitride (h-BN), has been extensively investigated for the thermally conductive polymeric composites due to its excellent electrical insulation, thermal conductivity, breakdown strength and chemical stability etc. However, because h-BN has high aspect ratio resulting in deteriorating through-plane thermal conduction owing to anisotropic nature along in-plane direction, isotropic alignment or utilizing isotropic filler is essential to achieve high out-of-plane thermal conductivity. In this work, spherical-like h-BN microparticles were assembled via spray-dry process and polydimethylsiloxane (PDMS) nanocomposites were fabricated with h-BN microspheres and flakes hybrid fillers. Furthermore, thermal conductivity of the PDMS based composites were investigated.