An inherently flame-retardant polyester diol (FRPE) containing phosphorus was successfully synthesized via condensation polymerization with the commercial reactive flame retardant 9,10-dihydro-10-[2,3-di(hydroxycarbonyl)propyl]-10-phospha-phenanthrene-10-oxide (DDP), adipic acid (AA), ethylene glycol (EG), and 1,4-butanediol (1,4-BDO). Flame-retardant polyurethane elastomers (FR-PUEs) were subsequently produced by employing FRPE, 4,4-diphenylmethane diisocyanate (MDI) and 1,4-BDO. The mechanical and thermal properties and flame retardancy of the resulting FR-PUEs were characterized by tensile tests, thermogravimetric analysis (TGA), differential scanning calorimetric (DSC) analysis, dynamic mechanical analysis (DMA), limiting oxygen index (LOI) analysis, vertical burning tests (UL-94), and cone calorimeter (CC) analysis. It was suggested that DDP would increase the interaction between the hard and soft segments, resulting in FR-PUEs of unexpected higher tensile strengths of up to 40.0 MPa. In addition, it was found that the introduction of DDP can give rise to an increase of the residual char yield and limiting oxygen index (LOI), whereas reduces the total heat release (THR). Especially, using a low phosphorus content of 0.72 wt.%, the vertical burning level and LOI of the resultant FR-PUE reached V-0 and 24% respectively, and reduced THR of 52.6 MJ/m² was obtained. The flame-retardant mechanism of phosphorus in DDP was proposed both in the gas and condensed phases based on cone calorimeter (CC), residual char analyses and TG-IR analysis.

通过以下方法成功合成了一种含磷的固有阻燃聚酯二醇（FRPE）商用反应性阻燃剂9,10-二氢-10- [2,3-二（羟羰基）丙基] -10-膦-菲-10-氧化物（DDP），己二酸（AA），乙二醇（ EG）和1,4-丁二醇（1,4-BDO）。随后通过使用FRPE，4,4-二苯基甲烷二异氰酸酯（MDI）和1,4-BDO生产阻燃聚氨酯弹性体（FR-PUE）。通过拉伸试验，热重分析（TGA），差示扫描量热法（DSC）分析，动态力学分析（DMA），极限氧指数（LOI）分析，垂直分析来表征所得FR-PUE的机械和热性能以及阻燃性燃烧测试（UL-94）和锥形量热仪（CC）分析。有人建议，DDP将增加硬和软段之间的相互作用，导致FR-PUE具有高达40.0 MPa的出乎意料的更高拉伸强度。另外，已经发现，引入DDP可以增加残余的炭收率和极限氧指数（LOI），而降低总的热释放量（THR）。特别是，使用0.72 wt。％的低磷含量，所得FR-PUE的垂直燃烧水平和LOI分别达到V-0和24％，THR降低为52.6 MJ / m获得²。基于锥形量热仪（CC），残留炭分析和TG-IR分析，提出了DDP中磷在气相和冷凝相中的阻燃机理。