Abstract
The use of functionalized silica nanoparticles for polymer filler likely reduces the processes in the production of rubbers. We prepare in this study mercaptopropyltriethoxysilane- (MPTES) and vinyltriethoxysilane- (VTES-) functionalized silica nanoparticles to investigate re-dispersion of the particles and mechanical properties of the rubber for which these nanoparticles are used as filler. The direct synthesis provided nanoparticles with wide distributions of particle sizes except the case of use of equimolar VTES and MPTES. The uniformity in particle size was improved by consecutive hydrolysis/condensation of silanes, where the organosilanes were added in the solution of tetraethyl orthosilicate (TEOS) and ammonium. The re-dispersion of dried power into the solvent was high (95%) for VTES-silica and low (1%) for MPTES-silica. The re-dispersion of VTES-MPTES doubly-functionalized silica (75%) was considerably improved from that of MPTES-silica. When this VTES-MPTES doubly-functionalized silica was used as the filler of tire rubber, the stress-strain curve was much improved from that with MPTES-silica.
Published Version
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