In order to further enhance the compatibility and flame retardant efficiency of metal–organic frameworks (IRMOF-3), diphenylphosphinyl chloride was reacted with free –NH₂ of IRMOF-3 to prepare an organic–inorganic hybrid (IRMOF-3-P, I-P), and its structure and properties were analyzed by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis. Then, I-P combined with hexaphenoxycyclotriphosphazene (HPCP) was applied to the flame retardant modification of EP resin, and their synergistic flame retardant effects were studied in detail by the thermal stability, flame retardancy, and mechanical properties of EP composites. The experimental results indicated that I-P particles could be well dispersed in the EP matrix. I-P combined with HPCP could promote the char formation of EP resin, delay ignitions, decrease the release of heat, smoke, CO, and CO₂ due to the release of phosphorus free radicals, and have a strong barrier effect, further leading to an increase in its limiting oxygen index to 32.0% and achieving an UL-94 V-0 rating. Finally, EP composites exhibited a good self-extinguishing property. These results proved that the combination of HPCP and I-P had an excellent flame retardant synergistic effect and endowed the EP composite with excellent flame retardancy. In addition, a moderate dose of I-P combined with HPCP can effectively improve the toughness and strength of the epoxy composite.

中文翻译：

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锌基有机骨架与二苯基非诺膦酰氯的杂化及其与六苯氧基环三磷腈的组合对环氧树脂的阻燃作用

为了进一步提高金属有机骨架材料(IRMOF-3)的相容性和阻燃效率，将二苯基次膦酰氯与IRMOF-3中的游离-NH ₂反应制备有机无机杂化物(IRMOF-3-P，IP )，并通过扫描电子显微镜、傅里叶变换红外光谱、X射线衍射和热重分析对其结构和性能进行了分析。然后，将IP与六苯氧基环三磷腈（HPCP）结合应用于EP树脂的阻燃改性，并通过EP复合材料的热稳定性、阻燃性和力学性能详细研究了两者的协同阻燃效果。实验结果表明IP颗粒能很好地分散在EP基质中。 IP与HPCP复合可促进EP树脂成炭，延迟点火，减少因磷自由基释放而产生的热量、烟雾、CO和CO ₂的释放，并具有较强的阻隔作用，进一步导致其极限氧指数为 32.0%，并达到 UL-94 V-0 等级。最后，EP复合材料表现出良好的自熄性能。这些结果证明HPCP与IP的组合具有优异的阻燃协同效应，赋予EP复合材料优异的阻燃性能。此外，中等剂量的IP与HPCP复合可以有效提高环氧复合材料的韧性和强度。