Method for preparing an organo-silicon sol and materials obtained from such a sol

摘要

The method consists in hydrolysing an initial volume Vsi of a precursor material comprising at least one polyalkoxysilane with a quantity of water such that 1 $\frac{x{H}_{2}O}{x\mathrm{Si}}\ge 10$ where x H2O and x Si represent the number of moles of H2O and Si present, respectively, the concentration of the hydrolysate up to a volume substantially equal to the initial volume Vsi, leaving the concentrated hydrolysate until segregation into an aqueous phase and an organo-silicon phase, and recovery of the organo-silicon phase. Application to optics.