Silica ormocer

If the hydrolyses in organosilicate-polymer systems are carried out with increased amounts of the silicate, bicontinuous phases can be obtained (with the silica and polymer phases interpenetrating one another) [213]. At still-higher concentrations of the silicate, the silica generated becomes the continuous phase, with the polymer dispersed in it. The result is a polymer-modified ceramic, variously called an "ORMOCER" [214,215], "CERAMER" [216,217], or "POLY-CERAM" [218,219]. It is obviously of considerable importance to determine how the elastomeric phase modifies the ceramic in which it is dispersed. 

Organic-silica hybrid materials have been used for multi-photon microfabrication. These include the acrylate-functionalized oligosiloxanes known as ORMOCERs, which have been polymerized by radical processes using conventional IP radical iniatitors, such as c.2 [221,234]. Commercial poly(dimethylsiloxane)-based resists containing vinyl and Si-H functionalities use two different 2PA-induced processes hydrosilylation catalyzed by the photodecomposition products of Cp PtMes (Cp = ti -methylcyclopentadienyl) and radical initiation by c.4 (Fig. 13) [235]. The former process was complicated by thermally-induced polymerization. 

Schmidt H., Kaiser A., Patzelt H., Scholze H. Mechanical and physical properties of amorphous solids based on (CH3)2SiO silica gels. J. Phys. C 1982 9 275-278 Schmidt H., Popall M. Inorganic-organic composites (ORMOCERs) for optical application. SPIE Proc. 1990 1328 249-257... 

The preparation procedure of novel ORMOCER hybrid matrix ZSUR is being pub-hshed (Reisfeld, 2004). The final solution ofZSURwas obtained from DURS (di-urethane siloxane), ESOR (epoxy-silica ormosil) and ZrOa precursor solutions. 

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