Fluoroalkyl end-capped oligomers possessing nonflammable and flammable characteristics in silica gel matrices after calcination at 800 degree C under atmospheric conditions

Fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide oligomer [R sub(F)-(DOBAA) sub(n)-R sub(F)] in silica nanocomposite can exhibit a nonflammability, even after calcination at 800 degree C, through the formation of ammonium hexafluorosilicate during nanocomposite reactions. In contrast, th...

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Bibliographic Details
Published inPolymer journal Vol. 42; no. 2; pp. 167 - 171
Main Authors Sawada, Hideo, Tashima, Tsukasa, Kakehi, Hiroshi, Nishiyama, Yusuke, Kikuchi, Mieko, Miura, Masashi, Sato, Yusuke, Isu, Norifumi
Format Journal Article
LanguageEnglish
Published 01.02.2010
Subjects
Calcination
Flammable
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Oligomers
Silicon dioxide
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Summary:Fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide oligomer [R sub(F)-(DOBAA) sub(n)-R sub(F)] in silica nanocomposite can exhibit a nonflammability, even after calcination at 800 degree C, through the formation of ammonium hexafluorosilicate during nanocomposite reactions. In contrast, the lack of formation of ammonium hexafluorosilicate during the usual composite reactions affords a flammable behavior for the R sub(F)-(DOBAA) sub(n)-R sub(F) oligomer in silica nanocomposite. Ammonium hexafluorosilicate is formed as a result of the dehydrofluorination of amido protons [-C(=O)NH-] in R sub(F)-(DOBAA) sub(n)-R sub(F) oligomer, with fluorine atoms in the oligomers catalyzed by both ammonia and silica nanoparticles in the composite reactions. In contrast, the lack of dehydrofluorination in the nanocomposite reaction under acidic conditions affords the usual flammable behavior for the oligomer.
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ISSN:0032-3896
DOI:10.1038/pj.2009.316