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. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Colucci, G., Di Gianni, A., Bongiovanni, R., Priola, A., Torello, F., Bracco, S., et al. (2010). Modification of silica by liquid polybutadienes containing alkoxysilane groups. MACROMOLECULAR SYMPOSIA, 296(1), 550-556 [10.1002/masy.201051072].
Modification of silica by liquid polybutadienes containing alkoxysilane groups
BRACCO, SILVIA;SOZZANI, PIERO ERNESTO
2010
Abstract
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. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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