Počet záznamů: 1

Solvent-free synthesis of reactive inorganic precursors for preparation of organic/inorganic hybrid materials

  1. 1.
    0363826 - UMCH-V 2012 RIV US eng J - Článek v odborném periodiku
    Beneš, Hynek - Galy, J. - Gérard, J. F. - Pleštil, Josef - Valette, L.
    Solvent-free synthesis of reactive inorganic precursors for preparation of organic/inorganic hybrid materials.
    Journal of Sol-Gel Science and Technology. Roč. 59, č. 3 (2011), s. 598-612 ISSN 0928-0707
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: sol–gel * alkoxysilane * epoxy
    Kód oboru RIV: CD - Makromolekulární chemie
    Impakt faktor: 1.632, rok: 2011

    Prehydrolyzed-condensed precursors containing amino or glycido groups were prepared via sol gel process without addition of solvent in any step of their preparation. The influence of the experimental set-up, the functionality and ratio of alkoxysilanes, and type of catalyst, on the structure buildup was studied. In the case of amino precursors, the sol–gel process was carried out at weak basic conditions while in the case of glycido precursors the sol–gel process was catalyzed by acid or neutral pH. The systems with high content of tetraethoxysilane led to the fast gel formation. In weak acid medium tetraethoxysilane formed larger, more condensed species as well as small structures with silanol groups. Strong acidic conditions led to the fast formation of insoluble silica particles in liquid (sol) phase containing monomeric alkoxysilanes.
    Trvalý link: http://hdl.handle.net/11104/0199478