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Formation And Hydrolytic Stabilty Of Oxygen Bridged Heterometal Bonds (Si-O-Ti, Si-O-Zr, Si-O-Ta) In Sol - Gel Materials

Published online by Cambridge University Press:  10 February 2011

M. Nacken ,
D. Hoebbel  and
H. Schmidt
M. Nacken
Affiliation:
Institut für Neue Materialien GmbH, Im Stadtwald, Geb. 43, D-66123 Saarbrucken, Germany
D. Hoebbel
Affiliation:
Institut für Neue Materialien GmbH, Im Stadtwald, Geb. 43, D-66123 Saarbrucken, Germany
H. Schmidt
Affiliation:
Institut für Neue Materialien GmbH, Im Stadtwald, Geb. 43, D-66123 Saarbrucken, Germany
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Abstract

Glycidoxypropyltrimethoxysilane (GPTS) and metal alkoxides are frequently used in preparation of heterometal hybrid polymers and find application e. g. as contact lens materials and hard coatings on polymers. Such materials require a high homogeneity of the structural unit at the molecular level, which is supported by the formation of oxygen bridged heterometal bonds and their hydrolytic stability. By means of 29Si and 17O NMR the formation of heterometal bonds like Si-O-Ti, Si-O-Zr, Si-O-Ta was evidenced in GPTS-hydrolysates with Ti(OEt)4, Ti(OEt)3AcAc, Zr(OBun)4, Zr(OBun)3AcAc, Ta(OEt)5 or Ta(OEt)4AcAc (AcAc = acetylacetone ligand) as additives. Signals of heterometal bonds can be detected in 17O NMR spectra in the range of 170 to 350 ppm and are characterized in 29Si NMIR spectra by defined chemical shifts to low (Si-O-Ta) and high magnetic fields (Si-O-Ti, Si-O-Zr) in comparison with signals of Si-O-Si bonds. The use of AcAc modified metal alkoxides leads to well resolved 29Si NMR spectra, which make the distinction between homo- and heterocondensed species easier. The addition of water to the sols (2 H2O / alkoxy group) leads to a degradation of heterometal bonds in favour of more homocondensed species, which reduces the homogeneity of such hybrid materials at the molecular level.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 576: Symposium DD – Organic/Inorganic Hybrid Materials II , 1999 , 221
Copyright
Copyright © Materials Research Society 1999

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References

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