Shi Zhe, Zhang Cong, Chen Xin-Gang, Li Ang, Zhang Yang-Fei
School of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
Nanomaterials (Basel). 2021 May 13;11(5):1289. doi: 10.3390/nano11051289.
Thermal conductive materials with reliable and high performances such as thermal interface materials are crucial for rapid heat transferring in thermal management. In this work, carbon fiber fabric and graphene reinforced segmented polyurethane composites (CFF-G/SPU) were proposed and prepared to obtain superior thermal, mechanical and electrical properties using the hot-pressing method. The composites exhibit excellent tensile strength and can withstand a tensile force of at least 350 N without breaking. The results show that, comparing with the SPU material, the thermal conductivity is increased by 28% for the CFF-G/SPU composite, while the in-plane electrical conductivity is increased by 8 orders of magnitude to 175 S·m. The application of CFF-G/SPU composite as a winding thermal interface material with electric-driven self-heating effect presents good performances of fluidity and interface wettability. The composite has great advantages in phase transition and filling the interfacial gap in the short time of few seconds under the condition of electrical field, with the interface temperature difference between two layers significantly reduced.
诸如热界面材料之类具有可靠且高性能的导热材料对于热管理中的快速热传递至关重要。在这项工作中，提出并制备了碳纤维织物和石墨烯增强的分段聚氨酯复合材料（CFF-G/SPU），以通过热压法获得优异的热、机械和电性能。该复合材料具有出色的拉伸强度，能够承受至少350 N的拉力而不破裂。结果表明，与SPU材料相比，CFF-G/SPU复合材料的热导率提高了28%，而面内电导率提高了8个数量级，达到175 S·m。CFF-G/SPU复合材料作为具有电驱动自热效应的绕组热界面材料的应用表现出良好的流动性和界面润湿性。该复合材料在电场条件下几秒钟的短时间内具有出色的相变和填充界面间隙的优势，两层之间的界面温差显著降低。
