Structural characterisation of a sol-gel copolymer synthesised from aliphatic and aromatic alkoxysilanes using 29Si-NMR spectroscopy |
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| Authors: | M Oubaha M Dubois B Murphy P Etienne |
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| Institution: | (1) Laboratoire des Matériaux Inorganiques CNRS UMR 6002, Université Blaise Pascal, 24 Avenue des Landais, Aubière, 63177, France;(2) Optical Sensors Laboratory/National Centre For Sensor Research, School of Physical Science, Dublin City University, Dublin 9, Ireland;(3) Laboratoire Des Verres, UMR 5587, Université de Montpellier II, Place Eugène Bataillon, Montpellier Cédex 5, 34090, France |
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| Abstract: | A hybrid organic-inorganic material was prepared from the hydrolytic co-condensation of 3-trimethoxysilylpropylmethacrylate
(MAPTMS) and diphenyldiethoxysilane (DPHDES). The synthesis was performed in three steps: (1) MAPTMS pre-hydrolysis, (2) addition
of DPHDES, and (3) further hydrolysis of the obtained mixture. 29Si nuclear magnetic resonance spectroscopy was used to characterise the structural evolution of the mineral network during
the synthesis. It revealed the catalytic effect of DPHDES on the condensation reaction of silanol groups, initially observed
for pre-hydrolysed MAPTMS. In addition, it was clearly demonstrated that the formation of the highest condensed species of
the aromatic oligomers (D2 species) occurred only in the presence of aliphatic oligomers, which decrease the sterical hindrance about the silicon nuclei. |
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