New approaches to surface-alkoxylated silica with increased hydrolytic stability

被引：54

作者：

Ossenkamp, GC

Kemmitt, T

Johnston, JH

机构：

[1] Ind Res Ltd, Lower Hutt, New Zealand

[2] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand

来源：

CHEMISTRY OF MATERIALS | 2001年 / 13卷 / 11期

关键词：

D O I：

10.1021/cm000883t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 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.

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页码：3975 / 3980

页数：6

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