Polymer composites with enhanced thermal conductivity via oriented boron nitride and alumina hybrid fillers assisted by 3-D printing |
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| Affiliation: | 1. Department of Materials Engineering, Kyonggi University, Suwon, South Korea;2. Electronic Materials & Device Research Center, Korea Electronics Technology Institute, Seongnam, South Korea;1. School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Engineering Laboratory of High Performance Nylon Engineering Plastics of China Petroleum and Chemical Industry, Zhengzhou University, Zhengzhou, 450000, China;2. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China;3. Jinguan Electric Co., Ltd, Nanyang, 473000, China;1. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;2. Department of Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China;3. Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China;4. Department of Materials, Shenzhen University, Shenzhen 518060, China;5. Department of Electronics Engineering, The Chinese University of Hong Kong, 999077, Hong Kong, China;6. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, 30332, GE, United States |
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| Abstract: | Herein, oriented boron nitride (BN)/alumina (Al2O3)/polydimethylsiloxane (PDMS) composites were obtained by filler orientation due to the shear-inducing effect via 3-D printing. The oriented BN platelets acted as a rapid highway for heat transfer in the matrix and resulted in a significant increase in the thermal conductivity along the orientation direction. Extra addition of spherical Al2O3 enhanced the fillers networks and resulted in the dramatic growth of slurry viscosity. This, together with filler orientation induced the synergism and provided large increases in the thermal conductivity. A high orientation degree of 90.65% and in-plane thermal conductivity of 3.64 W/(m?K) were realized in the composites with oriented 35 wt% BN and 30 wt% Al2O3 hybrid fillers. We attributed the influence of filler orientation and hybrid fillers on the thermal conductivity to the decrease of thermal interface resistance of composites and proposed possible theoretical models for the thermal conductivity enhancement mechanisms. |
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| Keywords: | Thermal conductivity Hybrid fillers 3-D printing Thermal interface resistance |
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