U. Schubert et al., Mechanical properties of an inorganic-organic hybrid polymer cross-linked by the cluster Zr4O2(methacrylate)(12), CHEM MATER, 13(11), 2001, pp. 3811
The flexural strength and the flexural modulus of inorganic-organic hybrid
polymers obtained by sol-gel processing and subsequent light-induced polyme
rization of bis-[(methacryloyloxy)propoxycarbonylethyl)](3-triethoxysilyl)p
ropylamine or (1,3(2)-bis-methacryloyloxypropyl)(3-triethoxysilylpropylamin
ocarbonyl)butyrate is enhanced by copolymerization with 10 wt % of the meth
acrylate-substituted oxozirconium cluster Zr4O2(OMC)(12). The mechanical pr
operties of the cluster-cross-linked hybrid polymers do not deteriorate upo
n water storage at 37 degreesC.