Methyltrimethoxysilane sol-gel polymerization in acidic ethanol solutions studied by 29Si NMR spectroscopy

被引：64

作者：

Dong, HJ

Lee, M

Thomas, RD

Zhang, ZP

Reidy, RF ^{[1
]}

Mueller, DW

机构：

[1] Univ N Texas, Dept Mat Sci, Denton, TX 76203 USA

[2] Kyungpook Natl Univ, Dept Ind Chem, Taegu 702701, South Korea

[3] Univ N Texas, Dept Chem, Denton, TX 76203 USA

[4] Univ N Texas, Dept Phys, Denton, TX 76203 USA

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2003年 / 28卷 / 01期

关键词：

NMR; methyltrimethoxysilane; cyclization; sol-gel chemistry;

D O I：

10.1023/A:1025690300105

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Si-29 solution NMR has been used to study the acid-catalyzed polymerization of methyltrimethoxysilane (MTMS) in ethanol. The complex reaction pathways have been analyzed, and the general trends described. New interpretations are given to the rate constants of condensation reactions. The steric effects and inductive effects are found to work in coordination to reduce the reactivity of the silicon sites with the increasing connectivity. The extensive cyclization is attributed to the low steric effects of a tetramer ring closure compared to other end/end species condensations.

引用

页码：5 / 14

页数：10

共 41 条

[1] Hydrolysis and esterification in organically modified alkoxysilanes: A Si-29 NMR investigation of methyltrimethoxysilane [J].