AUTHOR=Zheng Xin’guo , Dong Quanxiao , Wang Xi , Yu Peiyun , Wang Weimin , Zhang Jinyong , Ren Lin TITLE=Improvement of Flame Retardancy of Polyurethane Foam Using DOPO-Immobilized Silica Aerogel JOURNAL=Frontiers in Materials VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.673906 DOI=10.3389/fmats.2021.673906 ISSN=2296-8016 ABSTRACT=

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.