Modification of Silica by Liquid Polybutadienes Containing Alkoxysilane Groups |
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Authors: | Giovanna Colucci Anna Di Gianni Roberta Bongiovanni Aldo Priola Francesca Torello Silvia Bracco Piero Sozzani |
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Institution: | 1. Department of Materials Science and Chemical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy;2. Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, 20125, Milano, Italy |
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Abstract: | Summary : The present work describes a method to modify the surface of silica, reducing its polar character and making it compatible and dispersible into hydrocarbon based elastomers. A liquid low molar mass polybutadiene (PB) was grafted with mercaptopropyltrimethoxysilane (MPTS) via radical addition of the thiol group to the double bonds. The silanized PB was reacted with silica via thermal condensation with its silanol groups. 29Si NMR spectra showed that the condensation reaction of the trifunctional silane involved one or two alkoxy groups, while the third alkoxy group remained unreacted, probably for steric reasons. The characterization of the functionalized silica particles was performed by contact angle measurements and TGA analysis. |
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Keywords: | alkoxysilane grafting polybutadiene silica surface solid state NMR spectroscopy |
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