Effects of Dimethyl Methylphosphonate (DMMP) Flame Retardant on Rigid Polyurethane Foam
In this work, dimethyl methylphosphonate (DMMP) was used as a flame retardant to prepare flame-retardant rigid polyurethane foam (RPUF). The LOI value of RPUF is increased from 18.2 (for RPUF without DMMP) to 26.5. TGA results indicate that the first and the third maximum weight loss temperature (Tmax1 and Tmax3) increase. Cone calorimeter (CC) results show that the peak of heat release rate (HRR) and smoke production rate (SPR) are respectively decreased by 43.1% and 22.4%, indicating that DMMP endows RPUF with excellent flame retardant properties. Particularly, the addition of DMMP hardly affects the physical-mechanical properties and morphology of RPUF.