Bioinspired modified graphite film with superb mechanical and thermoconductive properties
Bioinspired modified graphite film with superb mechanical and thermoconductive properties
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DOI：
10.1016/j.carbon.2021.05.019
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发表时间：
2021-08
期刊：
影响因子：
10.9
通讯作者：
Xiaomeng Zhao;Wei Li;Yunjing Wang;Hao Li;Jianfeng Wang
中科院分区：
文献类型：
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作者：
Xiaomeng Zhao;Wei Li;Yunjing Wang;Hao Li;Jianfeng Wang
人们正在寻求轻质、坚韧、耐热和导热材料来替代金属，用于军事、汽车和航空航天领域大功率电气设备的热管理。在这项工作中，互连聚（对亚苯基-2,6-苯并二恶唑）纳米纤维网络通过模仿天然珍珠质独特的多层微观结构来改性石墨膜。良好取向的石墨纳米片与坚固的3D纳米纤维网络的耦合不仅赋予改性石墨薄膜优异的机械性能，而且还具有优异的导热性能。拉伸强度（200.5±1.5MPa）、断裂应变（24.3±0.6%）、韧性（38.5±0.7MJ/m3）和耐折度（>10000次）分别是未经改性的纯石墨膜的16.7倍、13.3倍、149.2倍和333.3倍，分别。卓越的机械性能与优异的热性能相结合，包括高导热率 (104.5–179.8 W/mK) 和良好的热稳定性 (652 °C) 以及不可燃性。这种低密度、优异的机械性能和导热性能的结合超越了7075型铝合金，这是一种用于航空航天设备热管理的典型散热金属材料。
Lightweight, tough, heat-resistant and thermoconductive materials are being pursued to replace metals for the thermal management of high-power electrical devices in military, automotive and aerospace fields. In this work, interconnective poly(p-phenylene-2,6-benzobisoxazole) nanofiber network is used to modify graphite film by mimicking the unique multilayered microstructure of natural nacre. The coupling of well-oriented graphite nanosheet and robust 3D nanofiber network not only endows the modified graphite film with superb mechanical property, but also with excellent thermal conduction property. The tensile strength (200.5 ± 1.5 MPa), strain-to-failure (24.3 ± 0.6%), toughness (38.5 ± 0.7 MJ/m3) and folding endurance (>10,000 times) are 16.7-fold, 13.3-fold, 149.2-fold and 333.3-fold higher than those of pure graphite film without modification, respectively. The superb mechanical properties are integrated with excellent thermal properties, including high thermal conductivity (104.5–179.8 W/mK) and good thermal stability (652 °C), as well as nonflammability. Such integration of low density, superb mechanical and thermoconductive properties surpasses 7075-type aluminum alloy, a typical heat dissipation metal material used for thermal management in aerospace devices.