Journal
FRONTIERS IN MATERIALS
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2021.673906
Keywords
polyurethane; flame retardancy; DOPO; silica aerogel; mechanism
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Funding
- National Natural Science Foundation of China [21504003]
- National Innovation Platform Open Fund [2017YJ163]
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By incorporating DOPO-immobilized silica aerogel nanoparticles as a flame retardant into polyurethane foams, the heat release rate and total heat release of the composites were effectively reduced, indicating an improved flame retardancy of the foams. It is believed that the DOPO-immobilized silica aerogel nanoparticles can inhibit the degradation of polyurethane and catalyze the formation of carbonaceous carbon on the surface.
In this work, silica aerogel was modified by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-1-oxide (DOPO). Then DOPO-immobilized silica aerogel nanoparticles were used as a flame retardant to prepare flame-retardant polyurethane foams. Microscale combustion calorimeter and cone calorimeter tests were employed to evaluate the flame retardancy of polyurethane foams. It was found that both the heat release rate and the total heat release of the composites were reduced with the incorporation of DOPO immobilized silica aerogel. It is speculated that the DOPO-immobilized silica aerogel nanoparticles can inhibit the degradation of polyurethane and catalyze the formation of carbonaceous carbon on the surface.
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