State Key Laboratory of Fire Science , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China.
ACS Appl Mater Interfaces. 2018 Sep 26;10(38):32688-32697. doi: 10.1021/acsami.8b11299. Epub 2018 Sep 14.
A covalent oxygen-rich CN (CNO) network derived from metal-organic framework (HKUST-1) was innovatively synthesized by a rapid and green microwave irradiation method. This method can produce CNO multilayers efficiently, which paves a way for practical application of the nanosheets. Structural characterization and synthesis processes of CNO nanosheets were investigated to further understand the key role of HKUST-1. The as-prepared CNO has a layered feature, which theoretically favors to improve flame retardancy and mechanical performance of polymers. Desirable results were obtained as expected: the fire safety, antitensile, and impact resistance of polylactic acid (PLA) were prominently enhanced after adding CNO nanosheets, which can be attributed to the excellent dispersion and compatibility. PLA/CNO nanocomposite was self-distinguished at 2 wt % content of CNO, whereas the tensile strength was increased more than 36% compared with that of pure PLA, as well as the impact strength. This work broadens the application fields of CNO and endows it a possibility of actual application.
一种源自金属有机骨架（HKUST-1）的共价富氧 CN（CNO）网络，通过快速、绿色的微波辐射方法被创新性地合成出来。该方法可以有效地生成 CNO 多层结构，为纳米片的实际应用铺平了道路。通过对 CNO 纳米片的结构表征和合成过程的研究，进一步理解了 HKUST-1 的关键作用。所制备的 CNO 具有层状特征，这从理论上有利于提高聚合物的阻燃性和机械性能。正如预期的那样，得到了令人满意的结果：添加 CNO 纳米片后，聚乳酸（PLA）的消防安全、拉伸和抗冲击性能得到显著提高，这归因于其优异的分散性和相容性。在 CNO 含量为 2wt%时，PLA/CNO 纳米复合材料就可以自行区分，与纯 PLA 相比，其拉伸强度提高了 36%以上，冲击强度也有所提高。这项工作拓宽了 CNO 的应用领域，并为其实际应用提供了可能性。
