Abstract

Inorganic−organic hybrid polymers were prepared by radical polymerization of methacrylic acid or methyl methacrylate with 0.5−2 mol % of the (meth)acrylate-substituted oxotitanium clusters Ti6O4(OEt)8(OMc)8 (OMc = methacrylate), Ti6O4(OPr)8(OAcr)8 (OAcr = acrylate), and the new clusters Ti4O2(OPri)6(OOCR)6 (OOCR = methacrylate or acrylate). A small cluster proportion is sufficient for an efficient cross-linking of the polymers. Glassy (PMMA) or powdery polymers (PMA) were obtained. With an increasing proportion of cluster, the surface area of the PMA powders increased considerably. The obtained hybrid polymers exhibit a higher thermal stability than the parent polymers because the thermal depolymerization is inhibited or at least retarded. The swelling index of cluster-cross-linked PMMA in organic solvents correlates with the cluster proportion. Small-angle scattering investigations showed that Ti6O4(OPr)8(OAcr)8 in PMMA and PMA and Ti4O2(OPri)6(OMc)6 in PMA is more evenly distributed than Ti4O2(OPri)6(OM...

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