Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 33: Novel materials I
CPP 33.5: Talk
Wednesday, March 9, 2005, 10:45–11:00, TU C230
Structure and properties characterization of novel Hybrid organic-inorganic nanomaterials based on modified titanium oxo-clusters — •Sondes trabelsi1, Rüdiger Häßler1, Sergio Bocchini2, Guilia Fornasieri3, Andreas Janke1, Nikolaos. E Zafeiropoulos1, Jocelyne Galy2, Laurence rozes3, Manfred Stamm1, Jean. Francois Gerard2, and Clément Sanchez3 — 1Department of Nanostructured Materials, Leibniz-Institut für Polymerforschung Dresden e.V, — 2LMM, INSA de Lyon, 20 Avenue A. Einstein, 69621 Villeurbanne Cedex, France — 3LCMC, UMR 7574, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex, France
Novel hybrid materials have been prepared via free radical polymerization of dimethacrylate/HEMA (50/50) in the presence of 2.5, 5 and 7.5 wt of organically modified titanium-oxo-clusters. SAXS, TEM and AFM Investigations, lead to consistent structural characteristics for the hybrid materials, with aggregate size distributions between 5 and 160 nm, depending also upon the Ti content. DMTA analysis of the hybrids revealed the presence of an optimum for the Ti content, which leads to an increase in the elastic moduli in the glassy state. On the other hand, in the rubbery state, the storage moduli and the Tg were found to increase with increasing of the Ti cluster content. TGA revealed an increase in the thermal stability of the hybrids compared to the matrix. UV- Vis spectra showed that the Ti clusters modified the optical properties of the matrix.