Enhanced thermal conductivity of polyurethane composites via engineering small/large sizes interconnected boron nitride nanosheets

材料科学 氮化硼 复合材料 热塑性聚氨酯 热导率 剥脱关节 聚氨酯 微电子 纳米复合材料 导电体 石墨烯 弹性体 纳米技术
作者
Zezhou Zhu,Chaowei Li,E Songfeng,Liyan Xie,Renjie Geng,Cheng‐Te Lin,Liqiang Li,Yagang Yao
出处
期刊:Composites Science and Technology [Elsevier BV]
卷期号:170: 93-100 被引量:185
标识
DOI:10.1016/j.compscitech.2018.11.035
摘要

Abstract With the decreased sizes of microelectronic devices, the excess heat has become one of the most important factors that shorten the lifetime of electronic components. As a result, developing materials with high-thermal conductivity is an urgent issue. In this study, we combine an ultrasonic exfoliation and evaporated self-assembly methods to prepare boron nitride nanosheets (BNNS)/thermoplastic polyurethane (TPU) composites with small (S) and large (L) sizes connected BNNS as additives. Our results indicate that BNNS/TPU nanocomposites have better thermal conductivity than TPU, and the optimum performance is achieved at 10 wt% BNNS(S/L-1/9)/TPU. This enhanced thermal conductivity is ascribed to the successful construction of effective thermal conductive pathway. The S-BNNS is connected to the adjacent L-BNNS in TPU, which can also form a dense structure. The formation of the continuous thermal conductive pathways and networks structure facilitate the heat diffusion throughout the composites, which are the key to achieving high thermal conductivity in polymer composites. Furthermore, these results may be helpful to the deeper understanding for the combined structure of fillers in polymer matrix, which will expand the scope of applications for these materials.
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