Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring
Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring
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DOI：
10.1016/j.matt.2019.08.013
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发表时间：
2020-01-08
期刊：
影响因子：
18.9
通讯作者：
Cheng, Qunfeng
中科院分区：
文献类型：
--
作者：
Peng, Jingsong;Huang, Chuanjin;Cheng, Qunfeng
环氧树脂纳米复合材料在航空航天等领域具有广阔的应用前景。然而，实现坚韧的环氧纳米复合材料仍然是一个巨大的挑战。提高环氧树脂纳米复合材料的机械性能的一个灵感是珍珠层，它具有显着的断裂韧性，其分层的“砖和砂浆”的架构。受此启发，我们通过冷冻浇铸技术制备了层状石墨烯支架。通过将环氧树脂渗透到这种石墨烯支架中来制备交替层状环氧-石墨烯纳米复合材料。由于我们的环氧-石墨烯纳米复合材料由类似于99重量%的有机环氧树脂组成，与含有类似于96重量%的无机文石的珍珠层形成对比，我们称其为“反珍珠层样”环氧-石墨烯层状纳米复合材料。它具有优异的断裂韧性，是纯环氧树脂的3.61倍，并由于各向异性石墨烯支架而表现出各向异性导电性，可用于检测裂纹。我们的生物启发策略提供了一种有前途的方法，联合收割机结合优异的机械性能与功能特性，以制造高性能的纳米复合材料。
Epoxy nanocomposites have many promising applications in the fields of aerospace and aeronautics, as well as many others. Achieving tough epoxy nanocomposites remains a great challenge, however. One inspiration for improving the mechanical properties of epoxy nanocomposites is nacre, which has remarkable fracture toughness for its layered "brick-and-mortar'' architecture. Inspired by this, we fabricated a lamellar graphene scaffold by the freeze-casting technique. An alternating-layered epoxy-graphene nanocomposite was made by infiltrating epoxy into this graphene scaffold. As our epoxy-graphene nanocomposite consists of similar to 99 wt % organic epoxy, in contrast to nacre containing similar to 96 wt % inorganic aragonite, we call it an "inverse nacre-like'' epoxy-graphene layered nanocomposite. It exhibits exceptional fracture toughness, 3.61 times that of pure epoxy, and demonstrates anisotropic conductivity due to the anisotropic graphene scaffold, which can be used to detect cracks. Our bioinspired strategy provides a promising approach to combine excellent mechanical properties with functional properties to fabricate high-performance nanocomposites.