METHODS AND COMPOUNDS FOR CONTROLLING THE MORPHOLOGY AND SHRINKAGE OF SILICA DERIVED FROM POLYOL-MODIFIED SILANES

摘要

Siliceous materials are prepared by adding one or more additives, includingwater soluble polymers, and derivatives thereof, to sols containingtetraalkoxysilanes derived from polyols. The polymers facilitate phaseseparation of the growing silica gel matrix, leading to high surface area self-supporting silica gels with cure occurring at ambient temperatures. Thematerials also show a significant reduction in shrinkage properties.