Shape controlled spherical (0D) and rod-like (1D) silica nanoparticles in silica/styrene butadiene rubber nanocomposites: Role of the particle morphology on the filler reinforcing effect

Hybrid SiO2@POSS nanofiller: a promising reinforcing system for rubber nanocomposites

“…9a), the anchoring of POSS nanounits onto SiO 2 NPs, even in a low amount (3 phr), leads to a significant increase of the modulus at low strain (G 0 0 ) if compared to SBR/ SiO 2 @POSS-0. Following the widely accepted mechanistic interpretation that the Payne effect is related to the breakdown of the filler network upon oscillatory shear, 8 the higher G 0 0 values obtained in the presence of SiO 2 @POSS hybrid particles point to a greater reinforcing effect. This behavior may be connected to the peculiar filler networking in the SBR/SiO 2 @POSS composites, where compact micrometric agglomerates are inhomogeneously distributed within the rubbery matrix, generating regions in which rubber is constrained (see Fig.…”

“…[1][2][3][4][5][6] In this context, we reported that the fine tuning of size and shape in silica nanoparticles (NPs), along with their surface organic functionalization, favors filler interaction with the polymer and allows the formation of a homogeneous and continuous percolative filler network which enhances the mechanical properties of the ensuing composites. 7,8 Recently, we also demonstrated that particles having an anisotropic shape are able to self-assemble in nanostructures inside the rubber matrix, providing an increase of the rubber immobilized at the filler/rubber interface and a consequent improvement of the mechanical properties. 9 These results suggest that the utilization of fillers with tailored structures and functionalities, able to simultaneously improve the filler networking and the filler-rubber interaction, increasing the amount of immobilized rubber, is a promising approach to obtain better mechanical properties of the composite and to limit the silica amount during compounding.…”

Mechanical and Electrical Properties of Elastomer Nanocomposites Based on Different Carbon Nanomaterials

“…Agglomeration leads to an increase in the volume fraction corresponding to the formation of a three-dimensional network structure that signicantly affects the dynamic viscoelastic properties. At this point, it is interesting to mention that in the work of Scotti et al [56] dealing with shape controlled and rod-like nanoparticles with different aspect ratios in SBR, the storage modulus at low strains, G' 0 , increases with the aspect ratio but the G' ∞ values are very similar for all the composites filled at a same filler loading. This means that the differences in reinforcement are less effective once the network is broken down which was expected since the filler synthesis has been targeted to obtain nanoparticles only different in shape.…”

“…In an interesting paper of Scotti et al [56], shape controlled spherical and rod-like silica nanoparticles with different aspect ratios were synthesized by a sol-gel method in order to prepare A comparative investigation on strain induced crystallization for graphene and carbon nanotubes filled natural rubber composites was also carried out by Fu et al [55] on composites prepared by ultrasonically-assisted latex mixing. The incorporation of graphene is shown to result in a faster strain-induced crystallization rate and a higher crystallinity compared to CNTs.…”

“…In an interesting paper of Scotti et al [56], shape controlled spherical and rod-like silica nanoparticles with different aspect ratios were synthesized by a sol-gel method in order to prepare silica/SBR composites by the blending method. The authors studied the influence of the particle morphology on the reinforcing effect independently of the silica surface chemistry and considering the aspect ratio as the only geometrical variance.…”