Chen Minhang, Chen Xiaojie, Zhang Junle, Xue Bingfeng, Zhai Shangyu, She Haibo, Zhang Yuancheng, Cui Zhe, Fu Peng, Pang Xinchang, Liu Minying, Zhang Xiaomeng
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.
The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2023 Jun 22;15(13):2780. doi: 10.3390/polym15132780.
Anisotropic thermally conductive composites are very critical for precise thermal management of electronic devices. In this work, in order to prepare a composite with significant anisotropic thermal conductivity, polyamide 12/styrene-acrylic copolymer-boron nitride (PA12/SA-BN) composites with macro and micro double anisotropic structures were fabricated successfully using 3D printing and micro-shear methods. The morphologies and thermally conductive properties of composites were systematically characterized via SEM, XRD, and the laser flash method. Experimental results indicate that the through-plane thermal conductivity of the composite is 4.2 W/(m·K) with only 21.4 wt% BN, which is five times higher than that of the composite with randomly oriented BN. Simulation results show that the macro-anisotropic structure of the composite (caused by the selective distribution of BN) as well as the micro-anisotropic structure (caused by the orientation structure of BN) both play critical roles in spreading heat along the specified direction. Therefore, as-obtained composites with double anisotropic structures possess great potential for the application inefficient and controllable thermal management in various fields.
各向异性导热复合材料对于电子设备的精确热管理至关重要。在本工作中，为了制备具有显著各向异性热导率的复合材料，采用3D打印和微剪切方法成功制备了具有宏观和微观双各向异性结构的聚酰胺12/苯乙烯-丙烯酸共聚物-氮化硼（PA12/SA-BN）复合材料。通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）和激光闪光法对复合材料的形貌和导热性能进行了系统表征。实验结果表明，仅含21.4 wt%氮化硼时，复合材料的面内热导率为4.2 W/(m·K)，比氮化硼随机取向的复合材料高出五倍。模拟结果表明，复合材料的宏观各向异性结构（由氮化硼的选择性分布引起）以及微观各向异性结构（由氮化硼的取向结构引起）在沿特定方向散热方面均起着关键作用。因此，所制备的具有双各向异性结构的复合材料在各个领域的高效可控热管理应用中具有巨大潜力。
