Ouyang Yuge, Li Xiaofei, Tian Huafeng, Bai Liuyang, Yuan Fangli
College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China.
Nanomaterials (Basel). 2021 Oct 9;11(10):2654. doi: 10.3390/nano11102654.
In this paper, we report a thermal conductive polymer composite that consists of silicone rubber (SR) and branched AlO (B-AlO). Owing to the unique two-dimensional branched structure, B-AlO particles form a continuous three-dimensional network structure by overlapping each other in the matrix, serving as a continuous heat conductive pathway. As a result, the polymer composite with a 70 wt% filler achieves a maximum thermal conductivity of 1.242 Wm K, which is equivalent to a significant enhancement of 521% compared to that of a pure matrix. In addition, the composite maintains a high volume resistivity of 7.94 × 10 Ω·cm with the loading of 70 wt%, indicating that it meets the requirements in the field of electrical insulation. Moreover, B-AlO fillers are well dispersed (no large agglomerates) and form a strong interfacial adhesion with the matrix. Therefore, the thermal decomposition temperature, residual mass, tensile strength, modulus and modulus of toughness of composites are significantly improved simultaneously. This strategy provides new insights for the design of high-performance polymer composites with potential application in advanced thermal management in modern electronics.
在本文中，我们报道了一种由硅橡胶（SR）和支化AlO（B - AlO）组成的导热聚合物复合材料。由于独特的二维支化结构，B - AlO颗粒在基体中相互重叠形成连续的三维网络结构，作为连续的热传导路径。结果，填充量为70 wt%的聚合物复合材料实现了1.242 Wm K的最大热导率，与纯基体相比显著提高了521%。此外，该复合材料在填充量为70 wt%时保持7.94×10Ω·cm的高体积电阻率，表明它满足电气绝缘领域的要求。而且，B - AlO填料分散良好（无大的团聚体）并与基体形成强界面粘附。因此，复合材料的热分解温度、残余质量、拉伸强度、模量和韧性模量同时得到显著提高。该策略为设计具有潜在应用于现代电子先进热管理的高性能聚合物复合材料提供了新的见解。
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