"Sloughing" of metal-organic framework retaining nanodots via step-by-step carving and its flame-retardant effect in epoxy resin
"Sloughing" of metal-organic framework retaining nanodots via step-by-step carving and its flame-retardant effect in epoxy resin
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DOI：
10.1016/j.cej.2022.137666
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发表时间：
2022-11-15
影响因子：
15.1
通讯作者：
Yang, Rongjie
中科院分区：
文献类型：
--
作者：
Song, Kunpeng;Hou, Boyou;Yang, Rongjie
空心纳米笼衍生自金属有机框架（MOFs）的功能更多的暴露的活性位点，更强的相互作用，和更好的相容性内的聚合物基质比固体块。然而，制备总是需要牺牲作为自模板的MOF。本文中，采用有机植酸和无机硼酸的顺序进行分步雕刻，可以将MOFs以具有高能平面的纳米点的形式保留在中空壳上，赋予杂化超结构产物（ZNs-B/CP）相对高的表面积和增强的催化性能。由于巧妙设计的化学组成和纳米结构，在环氧树脂中负载2wt%的ZNs-B/CP，在快速成炭机制的辅助下，极限氧指数提高到28.4%，放热速率峰值和总放热峰值分别降低43.1%和11.9%，对复合材料的机械强度影响较小。在MOFs研究的背景下，本工作补充了一种可行的MOFs纳米点的合成方法，并提出了作为环氧树脂阻燃剂的潜在应用。
Hollow nanocages derived from metal-organic frameworks (MOFs) feature more exposed active sites, stronger interactions, and better compatibility within the polymer matrix than solid blocks. Nevertheless, the preparation always requires the sacrifice of MOFs as a self-template. Herein, using step-by-step carving in the sequence of organic phytic acid and inorganic boric acid, MOFs can be retained in the form of nanodots with high-energy plane decorated on the hollow shells, endowing the hybrid superstructure product (ZNs-B/CP) with a relatively high surface area and enhanced catalytic properties. Owing to the ingeniously designed chemical composition and nanostructures, a load of 2 wt% ZNs-B/CP into epoxy resin improved the limiting oxygen index to 28.4% and decreased the peak of heat release rate and total heat release by 43.1% and 11.9%, respectively, assisted by the fast char formation mechanism, with slight influence on the mechanical strengths of the composites. Under the background of burgeoning investigations for MOFs, this work supplements a feasible synthetic artifice for MOF nanodots and proposes a potential application as a flame retardant for epoxy resin.