Polyol-modified silanes as precursors for silica

Details Polyol-modified silanes as precursors for silica Polyol-modified silanes as precursors for silica

C - Chemistry, Metallurgy

07

F

C07F 7/04 (2006.01) A61K 47/48 (2006.01) B01D 15/08 (2006.01) B01J 20/10 (2006.01) B01J 20/28 (2006.01) B01J 20/283 (2006.01) B01J 20/32 (2006.01) C01B 33/16 (2006.01) C07H 23/00 (2006.01)

Patent

CA 2486676

The invention relates to the preparation of monolithic silica under mild conditions from alkoxysilanes derived from sugars, sugar acids, sugar alcohols and polysaccharides including glycerol, sorbitol, mannose and dextran. Unlike the commonly used silica starting material TEOS (Si(OEt)4), the sol-gel hydrolysis and cure of the sugar derivatives are not very sensitive to pH as similar rates of gelation were observed over a pH range of about 5.5-11. The morphology of the resulting silicas could be varied using specific additives, including multivalent ions and hydrophilic polymers.

L'invention concerne la préparation de silice monolithique dans des conditions douces, à partir d'alcoxysilanes dérivés de sucres, d'acides sacchariques, d'alcools de sucre et de polysaccharides, parmi lesquels figurent du glycérol, du sorbitol, du mannose et du dextrane. Contrairement à ce qui se passe avec le précurseur de silice généralement utilisé, à savoir le TEOS (Si(OEt)¿4?), l'hydrolyse par voie sol-gel et le traitement des dérivés du sucre ne sont pas très sensibles au pH, dans la mesure où des vitesses de gélification similaires ont été observées pour une plage de pH comprise entre 5,5 et 11. La morphologie des silices obtenues peut être modifiée au moyen d'additifs spécifiques, y compris des ions multivalents et des polymères hydrophiles.

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