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

A method for preparing an organo-silicon soil, characterised in that it comprises:

• a) hydrolysis of an initial volume Vsi of a precursor material containing at least an organo-silicon monomer precursor with formula:
• R1nsi (OR2)4-n (i)
• in which
• the radicals R1, identical or different, represent an alkyl group, an aryl group, a vinyl group or H,
• the radicals R2, identical or different, represent H or an alkyl group, and
• n is an integer varying from 1 to 2, and n=2 if R1 represents H, with a water quantity such as
• 7 x ⁢ ⁢ H 2 ⁢ O x ⁢ Si ≥ 10
• and, with a possible quantity of an organic solvent such that
• 8 0 ≤ x ⁢ Solvent x ⁢ Si ≤ 8
• where x H2O, x si and x solvent represent, respectively, the number of moles of H2O, si and solvent present:
• and under the condition that when
• 9 x ⁢ ⁢ H 2 ⁢ O x ⁢ Si = 10 , x ⁢ Solvent = 0 ,
• to obtain a hydrolysate of the precursor material;
• b) concentration of the hydrolysate down to a volume substantially equal to the initial volume Vsi;
• c) leaving the concentrated hydrolysate until a distinct aqueous phase and a distinct organo-silicon phase are obtained, and
• d) separation and collection of the organo-silicon phase.