HYDROPHOBIC AEROGELS FROM SI(OME)4/MESI(OME)3 MIXTURES

被引：103

作者：

SCHWERTFEGER, F

GLAUBITT, W

SCHUBERT, U

机构：

[1] UNIV WURZBURG,INST ANORGAN CHEM,W-8700 WURZBURG,GERMANY

[2] FRAUNHOFER INST SILICATFORSCH,W-8700 WURZBURG,GERMANY

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1992年 / 145卷 / 1-3期

关键词：

Gels;

D O I：

10.1016/S0022-3093(05)80435-1

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：

Gels prepared from mixtures of Si(OMe)4 and MeSi(OMe)3 under basic conditions were supercritically dried by the methanol process. In aerogels prepared from only Si(OMe)4, 30% of the silicon atoms still contain an OMe substituent. When Si(OMe)4/MeSi(OMe)3 Mixtures are employed, most of the residual methoxy substituents are replaced by methyl substituents. Thus, a permanent hydrophobicity is provided to the aerogels without affecting the average degree of condensation per silicon atom. The use of 40% or more MeTMOS in the preparation of the aerogels lowers the degree of condensation beyond that of pure 'SiO2' aerogels.

引用

页码：85 / 89

页数：5