Unraveling molecular design-performance relationship in automobile tires
The addition of fillers to rubbers is a powerful route to improving mechanical and other properties and designing next-generation engineering materials including automobile tires. There is general agreement that "bound rubber" (BR) (i.e., polymer chains physisorbed on the filler surfaces) is a critical parameter for rubber reinforcement. However, a molecular mechanism behind the "BR-induced reinforcement" is still missing in this comparatively mature field. Our previous investigations using neutron scattering/spectroscopy techniques and molecular dynamics simulations of a simplified carbon black (CB)-filled polybutadiene revealed the novel structures and dynamics of BR and the roles of the structural partitions and dynamical hierarchies in rubber reinforcement. We here expand this integrated methodology to industrially more interesting silica-reinforced rubbers. The bottleneck of silica-reinforced rubbers is the weak reinforcement effect compared to CB-filled rubbers. The comparison of the structures and dynamics of the BR between CB and silica filler surfaces through this research is a critical step toward material design insight into filled rubbers necessary for future tires.
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KOGA Tadanori; ALLGAIER Juergen; FARAGO Bela; KRUTEVA Margarita; NAGAO Michihiro; PORCAR Lionel and RICHTER Dieter. (2023). Unraveling molecular design-performance relationship in automobile tires. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-665
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