New approaches to surface-alkoxylated silica with increased hydrolytic stability

Authors
Ossenkamp, GC Kemmitt, T Johnston, JH
Citation
Gc. Ossenkamp et al., New approaches to surface-alkoxylated silica with increased hydrolytic stability, CHEM MATER, 13(11), 2001, pp. 3975-3980
Citations number
29
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
08974756 → ACNP
Volume
13
Issue
11
Year of publication
2001
Pages
3975 - 3980
Database
ISI
SICI code
0897-4756(200111)13:11<3975:NATSSW>2.0.ZU;2-N
Abstract
Surface-alkoxylated silica can be prepared by reacting precipitated silica with high-boiling and polymeric alcohols. The structure of the products was investigated through C-13 and Si-29 MAS NMR experiments. The influence of the alkoxy group structure and density on the hydrolytic stability of the a lkoxylated silicas was determined through contact with boiling water. Use o f polymeric or branched alcohols increased the hydrolytic stability of surf ace-alkoxylated silicas compared to straight-chain alcohols. The rate of su rface substitution is increased by both acid and base catalysis.