Hybrid sol–gel coating agents based on zirconium(IV) propoxide and epoxysilane
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The hybrid sol–gel was synthesized as a basis for preparing coatings for use as anticorrosion and antibacterial protectants of medical implants. Coatings were prepared using (3-glycidyloxypropyl)trimethoxysilane and zirconium(IV) propoxide as precursors, with acetic acid as a catalyst. The synthesis was followed using in situ Fourier transform infrared spectroscopy. Specific steps of the synthesis were followed by 1H nuclear magnetic resonance spectroscopy. The reactions of zirconium(IV) propoxide and (3-glycidyloxypropyl)trimethoxysilane with acetic acid differed; acetate was formed only in the reaction between zirconium(IV) propoxide and acetic acid. The reaction of the opening of the epoxy ring of GPTMS was followed, during both synthesis and curing, at room temperature and at 150 °C. The opening of epoxy ring was catalysed thermally. The thermal stability of the prepared sol was determined by thermogravimetric analysis.
KeywordsHybrid sol–gel coating Zirconium(IV) propoxide (3-glycidyloxypropyl)trimethoxysilane (GPTMS) FTIR NMR
Financial support by the Slovene Research Agency is acknowledged (Grants Nos. P2-0148 and P1-0134). The authors thank the Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins (CIPKeBiP) for use of the ReactIR™ 45 FTIR instrument and accompanying equipment, Prof. Barbara Malič from the Jožef Stefan Institute and Centre of Excellence NAMASTE, Advanced Materials and Technologies for the Future, for the use of PerkinElmer Spectrum 100 instrument, and the National NMR Centre at the National Institute of Chemistry. The authors thank Prof. R.H. Pain for proof reading the manuscript.