A novel MoS2-DOPO hybrid has been successfully synthesized through the grafting of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) on the surface of MoS2 nanosheets using allyl mercaptan as an intermediate. MoS2-DOPO was used as a flame retardant additive to prepare flame-retardant flexible polyurethane foam (FPUF). The influence of MoS2-DOPO on the mechanical, thermal stability, and flame retardancy properties of FPUF composites were systematically investigated. The incorporation of MoS2-DOPO could not deteriorate greatly the tensile strength and 50% compression set of FPUF composites, but effectively improves the char residue. The cone calorimeter and smoke density tests results revealed that the peak heat release rate, total heat release, and the maximum smoke density of the MoS2-DOPO/FPUF composite were reduced by 41.3, 27.7, and 40.5%, respectively, compared with those of pure FPUF. Furthermore, the char residue after cone calorimeter tests and pyrolysis gaseous products of the MoS2-DOPO/FPUF composite were analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and thermogravimetric analysis/infrared spectrometry. The results suggested that the MoS2-DOPO hybrid played a synergistic flame retardant effect of gas and condensed bi-phase action. In addition, a possible flame retardancy and smoke suppression mechanism of the MoS2-DOPO/FPUF composite were proposed. This study provides a facile and promising strategy for the fabrication of polymer materials with excellent flame retardancy and smoke suppression properties.

中文翻译：

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新型MoS2-DOPO杂化物，可有效增强柔性聚氨酯泡沫的阻燃性和抑烟性。

通过使用烯丙基硫醇作为中间体，在MoS2纳米片的表面上接枝9,10-二氢-9-氧杂-10-磷酸菲并-10-氧化物（DOPO），已成功合成了新型MoS2-DOPO杂化物。MoS2-DOPO用作阻燃添加剂以制备阻燃软质聚氨酯泡沫（FPUF）。系统地研究了MoS2-DOPO对FPUF复合材料的机械性能，热稳定性和阻燃性能的影响。MoS2-DOPO的加入不会大大降低FPUF复合材料的拉伸强度和50％压缩永久变形，但有效地改善了炭渣。锥形量热仪和烟雾密度测试结果表明，MoS2-DOPO / FPUF复合材料的峰值放热速率，总放热和最大烟雾密度分别降低了41.3、27.7和40。与纯FPUF相比，分别为5％。此外，通过扫描电子显微镜，能量色散X射线光谱，X射线衍射和热重分析/红外光谱法分析了锥形量热仪测试后的焦炭残留物和MoS2-DOPO / FPUF复合物的热解气态产物。结果表明，MoS2-DOPO杂化体具有气体的协同阻燃作用和冷凝的双相作用。此外，提出了MoS2-DOPO / FPUF复合材料可能的阻燃和抑烟机理。这项研究为制造具有出色阻燃性和抑烟性的聚合物材料提供了一种简便而有前途的策略。通过扫描电子显微镜，能量色散X射线光谱，X射线衍射和热重分析/红外光谱分析了锥形量热仪测试后的焦炭残留物和MoS2-DOPO / FPUF复合物的热解气态产物。结果表明，MoS2-DOPO杂化体具有气体的协同阻燃作用和冷凝的双相作用。此外，提出了MoS2-DOPO / FPUF复合材料可能的阻燃和抑烟机理。这项研究为制造具有出色阻燃性和抑烟性的聚合物材料提供了一种简便而有前途的策略。通过扫描电子显微镜，能量色散X射线光谱，X射线衍射和热重分析/红外光谱法分析了锥形量热仪测试后的焦炭残留物和MoS2-DOPO / FPUF复合材料的热解气态产物。结果表明，MoS2-DOPO杂化体具有气体的协同阻燃作用和冷凝的双相作用。此外，提出了一种可能的MoS2-DOPO / FPUF复合材料的阻燃和抑烟机理。这项研究为制造具有出色阻燃性和抑烟性的聚合物材料提供了一种简便而有前途的策略。和热重分析/红外光谱。结果表明，MoS2-DOPO杂化体具有气体的协同阻燃作用和冷凝的双相作用。此外，提出了MoS2-DOPO / FPUF复合材料可能的阻燃和抑烟机理。这项研究为制造具有出色阻燃性和抑烟性的聚合物材料提供了一种简便而有前途的策略。和热重分析/红外光谱。结果表明，MoS2-DOPO杂化体具有气体的协同阻燃作用和冷凝的双相作用。此外，提出了MoS2-DOPO / FPUF复合材料可能的阻燃和抑烟机理。这项研究为制造具有出色阻燃性和抑烟性的聚合物材料提供了一种简便而有前途的策略。