Three novel phosphorus‐containing Salen‐based derivatives (Salen‐DPCP‐M: M = Ni, Zn, and Mn), which include both phenyl phosphate structures (DPCP) and Salen‐metal complexes, were prepared for enhancing the fire safety of thermoplastic polyurethane (TPU). Thermogravimetric analysis (TGA) showed that Salen‐DPCP‐M altered the thermal degradation pathways of TPU probably due to the phosphorus‐containing structure of Salen‐DPCP‐M. The cone calorimeter test showed that the addition of 3 wt% of Salen‐DPCP‐Ni, Salen‐DPCP‐Zn, and Salen‐DPCP‐Mn lowered the peak of heat release rate (PHRR) from 1495 kW/m² for neat TPU to 690, 875, and 813 kW/m², respectively, for the TPU composites, which demonstrated that Salen‐DPCP‐M improved the fire safety of TPU. In addition, the release of toxic CO gas from the Salen‐DPCP‐Ni/TPU and Salen‐DPCP‐Zn/TPU composites was reduced by 78.2% and 80.0%, respectively. The results of TGA/infrared spectrometry (TG‐FTIR) showed that the incorporation of Salen‐DPCP‐Ni promoted the release CO₂, while reducing the formation of harmful gases. Laser Raman spectroscopy (LRS) and scanning electron microscopy (SEM) showed that Salen‐DPCP‐Ni/TPU and Salen‐DPCP‐Zn/TPU composites formed a dense and stable char layer. Herein, the mechanism of these flame retardants containing novel phosphorus‐containing Salen‐metal complexes is also proposed.

中文翻译：

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研究含磷的Salen-金属配合物可增强热塑性聚氨酯（TPU）的防火安全性

为增强热塑性塑料的防火性能，制备了三种新型的含磷Salen基衍生物（Salen-DPCP-M：M = Ni，Zn和Mn），其中包括磷酸苯酯结构（DPCP）和Salen-金属配合物。聚氨酯（TPU）。热重分析（TGA）表明Salen-DPCP-M改变了TPU的热降解途径，这可能是由于Salen-DPCP-M的含磷结构所致。锥形量热仪测试显示，添加3 wt％的Salen-DPCP-Ni，Salen-DPCP-Zn和Salen-DPCP-Mn可将纯TPU的放热速率（PHRR）峰值从1495 kW / m ^2降低达到690、875和813 kW / m ²分别用于TPU复合材料，这表明Salen-DPCP-M改善了TPU的防火性。此外，从Salen-DPCP-Ni / TPU和Salen-DPCP-Zn / TPU复合材料中释放的有毒CO气体分别减少了78.2％和80.0％。TGA /红外光谱（TG-FTIR）的结果表明，Salen-DPCP-Ni的引入促进了CO ₂的释放，同时减少了有害气体的形成。激光拉曼光谱（LRS）和扫描电子显微镜（SEM）表明，Salen-DPCP-Ni / TPU和Salen-DPCP-Zn / TPU复合材料形成了致密且稳定的炭层。本文还提出了含有新型含磷Salen-金属配合物的阻燃剂的机理。