Bi‐phase flame‐retardant effect of dimethyl methylphosphonate and modified ammonium polyphosphate on rigid polyurethane foam. (10th July 2019)

• Record Type: Journal Article
• Authors: Li, Linshan; Chen, Yajun; Wu, Xingde; Xu, Bo; Qian, Lijun
• Is Part Of: Polymers for advanced technologies. Volume 30:Number 11(2019)
• Page Start: 2721
• Page End: 2728
• Publication Date: 2019-07-10
• Subjects: dimethyl methylphosphonate -- flame retardant -- modified ammonium polyphosphate -- phosphorus‐containing free radicals -- polyurethane foam; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pat.4702
• Languages: English
• ISSNs: 1042-7147

Abstract

Abstract : 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 PO2 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.