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Flame‐retardant rigid polyurethane foams prepared with amorphous sodium polyborate
Author(s) -
Tsuyumoto Isao,
Onoda Yasutoshi,
Hashizume Fumiya,
Kinpara Eisuke
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34025
Subject(s) - polyurethane , materials science , fire retardant , char , differential scanning calorimetry , thermogravimetry , composite material , cone calorimeter , blowing agent , scanning electron microscope , polyethylene , butane , penetration (warfare) , calorimetry , chemical engineering , combustion , chemistry , organic chemistry , physics , operations research , engineering , thermodynamics , catalysis
Highly flame‐retardant rigid polyurethane (RPU) foams were prepared by vacuum impregnation or pressure impregnation of sodium polyborate (SPB) solution. The RPU foams (10 mm thickness, 134–690% SPB) endured the flame of a butane gas burner for 167–1144 s, and the backside temperatures remained below 45°C until penetration occurred. The heat releases from the RPU foams with 150 and 400% SPB in air in the cone calorimeter tests were 8.8 and 4.1 MJ/m 2 , respectively. The analyses with thermogravimetry, differential scanning calorimetry, and scanning electron microscopy indicated the flame‐retardant mechanism, in which the SPB foam and the formed char layer together insulated the inside from oxygen gas and heat. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011