Synthesis of periodic mesoporous organosilica from bis(triethoxysilyl)methane and their pyrolytic conversion into porous SiCO glasses

Bérangère Toury (1) , Florence Babonneau (2)

1 LMI - Laboratoire des Multimatériaux et Interfaces
2 LCMCP (site Paris VI) - Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI)

Periodic mesoporous organosilica (PMO) have been prepared from bis(triethoxysilyl)methane (BTM) and cetyltrimethylammonium chloride (C16TAC). A large range of synthesis conditions (pH, C16TAC/BTM ratio, post-treatment and concentration) were used to study their effects on the structure of the as-prepared meso-structured samples. The sample obtained with the optimised composition presents a 2D-hexagonal structure with a large surface area of about 950 m2/g. This material has been pyrolysed under Argon up to 1000 °C. Conversion into a silicon oxycarbide glass has been followed by X-ray diffraction. The organised structure can be retained until 800 °C. Further characterisations were performed by 29Si MAS NMR, 13C CP MAS NMR and N2 adsorption–desorption experiments to follow the structural changes occurring during the pyrolysis.

Mots clés: Periodic mesoporous organosilica; Sol–gel process; Pyrolysis; Porous glasses

Domaines: Chimie; Matériaux

Bérangère Toury, Florence Babonneau. Synthesis of periodic mesoporous organosilica from bis(triethoxysilyl)methane and their pyrolytic conversion into porous SiCO glasses. Journal of the European Ceramic Society, 2005, 25 (2-3), pp.265-270. ⟨10.1016/j.jeurceramsoc.2004.08.013⟩. ⟨hal-02579395⟩