Chapter 33
In Situ Formed Siloxane-Silica Filler for Rubbery Organic Networks Libor Matějka
Downloaded by FUDAN UNIV on March 15, 2017 | http://pubs.acs.org Publication Date: May 4, 2000 | doi: 10.1021/bk-2000-0729.ch033
Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, HeyrovskýSq. 2, 162 06 Prague 6, Czech Republic
Rubbery epoxide network was reinforced with a silica filler formed in situ by the sol-gel process from tetraethoxysilane (TEOS). Simultaneous or sequential polymerization of organic monomers and TEOS were used to form a microphase separated epoxy-silica hybrid system. Structure evolution during polymerization was followed using small-angle x-ray scattering and the cured networks were characterized by electron microscopy and dynamic mechanical analysis showing the morphology, interphase interaction and mechanical properties. Reaction conditions of the sol-gel process and polymerization procedure determine the reaction mechanism, structure of siloxane -silica regions and interaction between silica and epoxy phases. Modulus increased by two orders of magnitudes at low contents of silica (
