聚磷酸铵
甲基膦酸二甲酯
阻燃剂
极限氧指数
聚氨酯
材料科学
热重分析
炭化
烧焦
复合数
复合材料
化学工程
高分子化学
热解
有机化学
化学
工程类
作者
Linshan Li,Yajun Chen,Xingde Wu,Bo Xu,Lijun Qian
摘要
The flame‐retardant rigid polyurethane foams (RPUFs) with dimethyl methylphosphonate (DMMP) and modified ammonium polyphosphate (MAPP) were prepared. The results showed that the limiting oxygen index (LOI) value was improved by adding DMMP into RPUF/MAPP composite; 10 wt% of DMMP addition can increase the LOI value from 24.3% to 26.0%, where the commercial application standard of RPUF is achieved. Further benefits of using DMMP/MAPP system included restraining of total heat and smoke release, improvement of thermal stability, and char yield of RPUF. The thermogravimetric analysis (TGA)‐gas chromatography‐mass spectrometer (GC‐MS) results indicated that DMMP/MAPP could continuously release PO 2 and PO·free radicals in the gas phase. In addition, DMMP/MAPP exhibited the charring effect and barrier effect in the condensed phase, such bi‐flame retardant effect exerted by DMMP/MAPP resulted in the enhanced flame retardant property of RPUF.
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