The Effect of Copolymerization of Tetraethylorthosilicate and Aluminum Hydroxonitrates

Polymerization of tetraethylorthosilicate (TEOS) in the presence of aqueous solutions of aluminum hydroxonitrates (Al(OH)x (NO3)3-x (02. 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.