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首页> 外文期刊>RSC Advances >Construction of sandwich-structured CoAl-layered double hydroxide@zeolitic imidazolate framework-67 (CoAl-LDH@ZIF-67) hybrids: towards enhancing the fire safety of epoxy resins
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Construction of sandwich-structured CoAl-layered double hydroxide@zeolitic imidazolate framework-67 (CoAl-LDH@ZIF-67) hybrids: towards enhancing the fire safety of epoxy resins

机译：夹心结构的CoAl层状双氢氧化物@沸石咪唑酸酯骨架-67（CoAl-LDH @ ZIF-67）杂种的构建：增强环氧树脂的防火性

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In this work, sandwich-like structured CoAl-LDH@ZIF-67 hybrids were constructed by in situ growth of nanosized ZIF-67 crystallites on CoAl-LDH nanoplates. The structure and morphology of CoAl-LDH@ZIF-67 hybrids were represented by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Transmission Electron Microscopy (TEM). Accordingly, the hybrids were introduced into epoxy resins to explore their effect on the thermal and fire safety properties of epoxy composites. With the introduction of 2% CoAl-LDH@ZIF-67 hybrids, the T _(10%) , T _(50%) and T _(max) values were decreased to some extent and the char residue yield was higher than that of pristine epoxy. The peak heat release rate (PHRR) of epoxy composites declined by 26.4%, in comparison with those of pure epoxy. Moreover, the quantity of smoke produced, toxic CO released and CO _(2) produced were suppressed markedly and decreased by 16.7%, 59.8% and 32.2%, respectively. A possible mechanism for improving fire safety was put forward based on the analysis of the carbon residues.
机译：在这项工作中，通过在CoAl-LDH纳米板上原位生长纳米级ZIF-67晶体，构建了类似三明治的结构化CoAl-LDH @ ZIF-67杂化体。 CoAl-LDH @ ZIF-67杂化物的结构和形貌由X射线衍射（XRD），傅立叶变换红外光谱（FTIR）和透射电子显微镜（TEM）表示。因此，将杂化物引入环氧树脂中，以探索它们对环氧复合材料的热和防火性能的影响。随着引入2％CoAl-LDH @ ZIF-67杂种，T _（10％），T _（50％）和T _（max）值均有一定程度的降低，且炭渣收率高于原始环氧树脂。与纯环氧树脂相比，环氧复合材料的峰值放热率（PHRR）下降了26.4％。此外，烟气产生量，有毒CO释放量和CO_（2）产生量得到显着抑制，分别降低了16.7％，59.8％和32.2％。在分析碳残留量的基础上，提出了一种提高防火安全性的可能机制。

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