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C. Lomoschitz, N. Moszner, G. Friedbacher, M. Puchberger, G. Kickelbick:
"Synthesis Of Phosphorus Coupling Agents And Their Use In The Modification Of Zirconia Surfaces";
Vortrag: 13. Österreichische Chemietage, Wien; 24.08.2009 - 27.08.2009; in: "13. Österreichische Chemietage", (2009), ISBN: 978-3-900554-66-8; 1 S.

Functionalization of various surfaces of inorganic materials gained increasing scientific attention in recent years partially based on the plethora of studies on hybrid materials and nano composites. Here we present an approach to enhance interaction between methacrylate based polymer and metal oxide particles. Phosphorus coupling agents (PCAs) were synthesized comprising different spacer chain lengths between the anchor group and the polymerizable moiety. The anchor group was varied between phosphate and phosphonate, enabling the covalent bonding of zirconia particles to a surrounding polymer matrix. Successful modification of zirconia was proven by FT-IR and ³¹P MAS NMR spectroscopy. With means of time dependent thermogravimetric analysis and carbon elemental analysis properties such as grafting densities up to 4.2 P-CAs/nm², which corresponds to a dense monolayer, were determined over reaction periods ranging from a few minutes up to several days. Further atomic force microscopy of a zirconia coated Si-wafer showed that modification of the surface takes place at a remarkably fast rate. Nitrogen sorption measurements at 77K showed that modification with P-CAs alters the surface properties of zirconia. Results obtained indicate interesting structure-property relations such as hydrophobization of the surface and introduction of pending double bonds, accessible for polymerization.

Projektleitung Guido Kickelbick:
Untersuchung der Wechselwirkungen von Haftkomponenten mit Zirkondioxid- und Edelmetall-Oberflächen sowie Bariumgläsern