EFFECTS OF DIMETHYLDIETHOXYSILANE ADDITION ON TETRAETHYLORTHOSILICATE SOL-GEL PROCESS

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The effect of the addition of dimethyldiethoxysilane (DDS) on the hydrolysis-condensation of tetraethylorthosilicate (TEOS) was investigated by varying the amount of DDS added to TEOS solutions (0-67% in more fraction) and the addition-time of DDS. The addition of a small amount of DDS remarkably decreased the gelation time of acid solutions of TEOS because of the rapid reaction of DDS and the suppression of the cyclic species from TEOS. A further increase in DDS content, however, made the gelation time longer, because the decrease of the average functionality and the increase of the cyclic species prevented the formation of a siloxane network. The lower degree of cross-linking and the release of cyclic species influenced the weight loss of gels in the drying process.
Publisher
ELSEVIER SCIENCE BV
Issue Date
1995-04
Language
English
Article Type
Article
Keywords

ORGANICALLY MODIFIED SILICATES; STATE SI-29 NMR; HYDROLYSIS; GLASSES; POLYCONDENSATION; TEOS

Citation

JOURNAL OF NON-CRYSTALLINE SOLIDS, v.183, no.3, pp.252 - 259

ISSN
0022-3093
DOI
10.1016/0022-3093(94)00631-8
URI
http://hdl.handle.net/10203/69842
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