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Polymerization of trialkoxysilanes. Effect of the organic substituent on the formation of gels
The sol-gel chemistry of a variety of trialkoxysilanes with different organic substituents, with methoxide or ethoxide substituents on silicon was examined at varying monomer concentrations ranging up to neat monomer and with different catalysts. Gels were prepared from tetramethoxysilane and tetraethoxysilane at identical concentrations for purposes of comparison. The polymerization reactions were monitored for the formation of gels, insoluble precipitates, soluble polymers, or polyhedral oligosilsesquioxanes.