Callaghan Innovation Research Papers

Back to Research Papers

TitleNew approaches to surface-alkoxylated silica with increased hydrolytic stability
Publication TypeJournal Article
Year of Publication2001
AuthorsOssenkamp, G.C., Kemmitt T., and Johnston J.H.
JournalChemistry of Materials
Pagination3975 - 3980
Date Published2001
ISSN08974756 (ISSN)
Keywordsacid, alcohol derivative, alkyl group, article, base, catalysis, chemical modification, chemical reaction, chemical structure, high temperature, Hydrolysis, molecular stability, nuclear magnetic resonance spectroscopy, polymer, precipitation, silicon dioxide, surface property, water
AbstractSurface-alkoxylated silica can be prepared by reacting precipitated silica with high-boiling and polymeric alcohols. The structure of the products was investigated through 13C and 29Si MAS NMR experiments. The influence of the alkoxy group structure and density on the hydrolytic stability of the alkoxylated silicas was determined through contact with boiling water. Use of polymeric or branched alcohols increased the hydrolytic stability of surface-alkoxylated silicas compared to straight-chain alcohols. The rate of surface substitution is increased by both acid and base catalysis.

Back to top