Sol-gel chemistry:: evidence of redistribution at silicon atom induced by NaOH as catalyst during ageing

被引：13

作者：

Cerveau, G ^{[1
]}

Corriu, RJP ^{[1
]}

Framery, É ^{[1
]}

机构：

[1] Univ Montpellier 2, Lab Chim Mol & Organ Solide, UMR 5637, F-34095 Montpellier 5, France

来源：

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE C-CHIMIE | 2001年 / 4卷 / 02期

关键词：

nanostructured hybrid organic-inorganic materials; hydrolytic poly-condensation; NaOH; redistribution during ageing;

D O I：

10.1016/S1387-1609(00)01189-0

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The influence of the ageing conditions on the properties of organic-inorganic hybrid solids obtained by sol-gel route using NaOH catalysis has been studied. The cases of 1,4-bis(trimethoxysilyl)benzene 1 ('rigid' precursor) and 1,4-bis(trimethoxysilylethyl)benzene 2 ('more flexible' one) have been investigated. The Si-29 CP MAS NMR spectra of the silsesquioxanes clearly reveal that Si-O-Si bond cleavage and redistribution reactions occur when ageing time is increased or is performed at higher temperatures. This particular behaviour observed only with NaOH is of importance in the choice of the catalyst. (C) 2001 Academie des sciences / Editions scientifiques et medicales Elsevier SAS.

引用

页码：79 / 83

页数：5

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