Hybrid silica-based fillers in nanocomposites: Influence of isotropic/isotropic and isotropic/anisotropic fillers on mechanical properties of styrene-butadiene (SBR)-based rubber
Authors
Staropoli M., Rogé V., Moretto E., Didierjean J., Michel M., Duez B., Steiner P., Thielen G., Lenoble D., Thomann J.S.
Reference
Polymers, vol. 13, n° 15, art. no. 2413, 2021
Description
The improvement of mechanical properties of polymer-based nanocomposites is usually obtained through a strong polymer-silica interaction. Most often, precipitated silica nanoparticles are used as filler. In this work, we study the synergetic effect occurring between dual silica-based fillers in a styrene-butadiene rubber (SBR)/polybutadiene (PBD) rubber matrix. Precipitated Highly Dispersed Silica (HDS) nanoparticles (10 nm) have been associated with spherical Stöber silica nanoparticles (250 nm) and anisotropic nano-Sepiolite. By imaging filler at nano scale through Scanning Transmission Electron Microscopy, we have shown that anisotropic fillers align only in presence of a critical amount of HDS. The dynamic mechanical analysis of rubber compounds confirms that this alignment leads to a stiffer nanocomposite when compared to Sepiolite alone. On the contrary, spherical 250 nm nanoparticles inhibit percolation network and reduce the nanocomposite stiffness.
