Zhang Cong, Shi Zhe, Li An, Zhang Yang-Fei
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
Polymers (Basel). 2020 Dec 16;12(12):3004. doi: 10.3390/polym12123004.
Thermal interface material (TIM) is crucial for heat transfer from a heat source to a heat sink. A high-performance thermal interface material with solid-solid phase change properties was prepared to improve both thermal conductivity and interfacial wettability by using reduced graphene oxide (rGO)-coated polyurethane (PU) foam as a filler, and segmented polyurethane (SPU) as a matrix. The rGO-coated foam (rGOF) was fabricated by a self-assembling method and the SPU was synthesized by an in situ polymerization method. The pure SPU and rGOF/SPU composite exhibited obvious solid-solid phase change properties with proper phase change temperature, high latent heat, good wettability, and no leakage. It was found that the SPU had better heat transfer performance than the PU without phase change properties in a practical application as a TIM, while the thermal conductivity of the rGOF/SPU composite was 63% higher than that of the pure SPU at an ultra-low rGO content of 0.8 wt.%, showing great potential for thermal management.
热界面材料（TIM）对于从热源到散热器的热传递至关重要。通过使用还原氧化石墨烯（rGO）包覆的聚氨酯（PU）泡沫作为填料，以及嵌段聚氨酯（SPU）作为基体，制备了一种具有固-固相变特性的高性能热界面材料，以提高热导率和界面润湿性。rGO包覆泡沫（rGOF）通过自组装方法制备，SPU通过原位聚合法合成。纯SPU和rGOF/SPU复合材料表现出明显的固-固相变特性，具有合适的相变温度、高潜热、良好的润湿性且无泄漏。结果发现，在作为TIM的实际应用中，SPU比没有相变特性的PU具有更好的热传递性能，而在超低rGO含量为0.8 wt.%时，rGOF/SPU复合材料的热导率比纯SPU高63%，显示出在热管理方面的巨大潜力。
