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Surface sedimentation and adherence of Nano‐SiO 2 to improve thermal stability and flame resistance of melamine‐formaldehyde foam via sol‐gel method
Author(s) -
Shi Yan,
Wang Ning,
Liu Li,
Liu Yuan
Publication year - 2018
Publication title -
fire and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.482
H-Index - 58
eISSN - 1099-1018
pISSN - 0308-0501
DOI - 10.1002/fam.2478
Subject(s) - materials science , thermal stability , melamine , composite material , chemical engineering , layer (electronics) , formaldehyde , thermal resistance , sol gel , nano , sedimentation , thermal , nanotechnology , chemistry , organic chemistry , paleontology , physics , sediment , meteorology , engineering , biology
Summary Melamine‐formaldehyde foam possesses intrinsic flame retardance; however, relative poor thermal stability and a certain amount of heat release rate restrict its applications in heated environment to a degree. In the present research, sol‐gel method has been adopted to precipitate nano‐SiO 2 particles on the surface of the melamine‐formaldehyde foam's fibers to construct a protective inorganic gel layer. Taking advantages of the shielding effects of the gel layer, the thermal‐oxygen degradation of the foam can be greatly retarded during heating; hence, the thermal stability is remarkably improved, and the flame retardance is further enhanced. In addition, introducing a small amount of membrane‐forming agent in the sol‐gel system can make the depositional nano‐SiO 2 particles well adhered to avoid dusting.