A novel liquid phosphorus-containing polyol named as PDEO was prepared via reactions between ethylene glycol and phenylphosphonic dichloride. PDEO reacts with the -NCO-terminated prepolymers and forms urethane linkages in the chain extension reaction step, thus, it was used to prepare inherently flame-retardant flexible polyurethane foams (FPUFs). The structure and properties of flame-retardant FPUF were characterized by scanning electron microscopy (SEM), tensile measurements, limiting oxygen index (LOI), vertical burning tests, cone calorimeter tests and thermogravimetric analysis (TGA). The vertical burning test demonstrated that fire extinguished instantly after the withdrawn of the pilot flame, while the PDEO loading was only 10 php. In addition, the persistent flame retardancy of PDEO in FPUFs was proved by thermal ageing test. The corresponding flame-retardant mechanism of PDEO-containing FPUFs was investigated by pyrolysis gas chromatography mass spectrometry (Py-GC/MS), X-ray photoelectron spectroscopy (XPS), SEM and FTIR, and the results indicated a gaseous phase dominated flame-retardant mechanism of PDEO.

通过乙二醇与二膦酸二苯酯的反应制备了一种新型的液态含磷多元醇，命名为PDEO。PDEO与-NCO封端的预聚物反应，并在扩链反应步骤中形成氨基甲酸酯键，因此，PDEO可用于制备固有的阻燃性柔性聚氨酯泡沫（FPUFs）。通过扫描电子显微镜（SEM），拉伸测量，极限氧指数（LOI），垂直燃烧测试，锥形量热仪测试和热重分析（TGA）对阻燃FPUF的结构和性能进行了表征。垂直燃烧测试表明，引燃火焰撤除后，火势即刻熄灭，而PDEO负载仅为10 php。另外，通过热老化试验证明了FPEO中PDEO的持久阻燃性。