The effect of copolymerization of tetraethylorthosilicate and aluminum hydroxonitratesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Polymerization of tetraethylorthosilicate (TEOS) in the presence of aqueous solutions of aluminum hydroxonitrates (Al(OH)(x)(NO3)(3-x) (0 < x < 2.5) was investigated by means of optical spectrophotometry and Al-27 NMR. It was shown that gelation rate increases drastically in the system with x > 2, The effect is due to copolycondensation of aluminum hydroxocomplexes and TEOS. Aluminum species entering copolymerization reaction have proved to contain tetrahedrally coordinated aluminum. The effect discovered might be useful for the preparation of certain metal oxide-silica composites or silicate materials, such as mullite.