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Modification of Silica by Liquid Polybutadienes Containing Alkoxysilane Groups
Author(s) -
Colucci Giovanna,
Di Gianni Anna,
Bongiovanni Roberta,
Priola Aldo,
Torello Francesca,
Bracco Silvia,
Sozzani Piero
Publication year - 2010
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201051072
Subject(s) - silanol , alkoxy group , polybutadiene , silane , polymer chemistry , contact angle , condensation reaction , fumed silica , condensation , materials science , double bond , steric effects , organic chemistry , chemical engineering , chemistry , copolymer , alkyl , composite material , catalysis , physics , engineering , thermodynamics , polymer
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. 29 Si 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.