In this work, a new type of leaf‐shaped cobalt‐zeolitic imidazolate framework–modified graphene (Co‐ZIF‐L@RGO) hybrid was successfully prepared and blended with an intumescent flame retardant (IFR). It was added into thermoplastic polyurethane (TPU) to study the effect of its combination with IFR on the thermal conductivity and flame retardant performance of TPU. The morphology and structure of the Co‐ZIF‐L@RGO hybrid were characterized by scanning electron microscope (SEM), Fourier transform infrared and X‐ray diffraction (XRD). The results showed that Co‐ZIF‐L were uniformly loaded on the surface of graphene. Furthermore, compared with pure TPU, the limiting oxygen index values of the composite material with 3 wt% Co‐ZIF‐L and 27 wt% IFR increased to 32.6%. Their UL‐94 rating reached V‐0 rating. Their peak heat release rate, total heat release, peak smoke production rate and total smoke production were also greatly reduced by 84.4%, 70.1%, 60.3% and 62.5%, respectively. The thermogravimetric‐infrared test results showed that the amount of toxic gas emissions was effectively suppressed. The residual carbon was analyzed by SEM, laser Raman spectroscopy and XRD, and flame retardant mechanism was further investigated. Besides, the addition of this hybrid improved the thermal conductivity of TPU.

中文翻译：

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叶状钴沸石咪唑酸酯骨架改性的石墨烯和膨胀型阻燃剂可改善热塑性聚氨酯的阻燃性和导热性

在这项工作中，成功制备了一种新型的叶形沸石-咪唑酸盐骨架改性石墨烯（Co-ZIF-L @ RGO）杂化物，并与膨胀型阻燃剂（IFR）混合。将其添加到热塑性聚氨酯（TPU）中，以研究其与IFR结合对TPU的导热性和阻燃性能的影响。通过扫描电子显微镜（SEM），傅立叶变换红外光谱和X射线衍射（XRD）对Co-ZIF-L @ RGO杂种的形态和结构进行了表征。结果表明，Co-ZIF-L被均匀地负载在石墨烯的表面上。此外，与纯TPU相比，Co-ZIF-L为3 wt％和IFR为27 wt％的复合材料的极限氧指数值增加到32.6％。他们的UL-94等级达到V-0等级。它们的峰值放热率，总放热 最高烟雾产生率和总烟雾产生率也分别大大降低了84.4％，70.1％，60.3％和62.5％。热重红外测试结果表明，有毒气体的排放量得到了有效抑制。通过SEM，激光拉曼光谱和XRD分析残留的碳，并进一步研究其阻燃机理。此外，这种混合材料的加入提高了TPU的导热性。