Multiscale Effects of Interfacial Polymer Confinement in Silica Nanocomposites

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  • Dispersing hydrophilic nanofillers in highly hydrophobic polymer matrices is widely used to tune the mechanical properties of composite material systems. The ability to control the dispersion of fillers is closely related to the mechanical tunability of such composites. In this work, we investigate the physical–chemical underpinnings of how simple end-group modification to one end of a styrene–butadiene chain modifies the dispersion of silica fillers in a polymer matrix. Using surface-sensitive spectroscopies, we directly show that polymer molecular orientation at the silica surface is strongly constrained for silanol functionalized polymers compared to nonfunctionalized polymers because of covalent interaction of silanol with silica. Silanol functionalization leads to reduced filler aggregation in composites. The results from this study demonstrate how minimal chemical modifications of polymer end groups are effective in modifying microstructural properties of composites by inducing molecular ordering of polymers at the surface of fillers.
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  • Varol, H. S., Sánchez, M. A., Lu, H., Baio, J. E., Malm, C., Encinas, N., ... & Parekh, S. H. (2015). Multiscale Effects of Interfacial Polymer Confinement in Silica Nanocomposites. Macromolecules, 48(21), 7929-7937. doi:10.1021/acs.macromol.5b01111
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  • 48
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  • 21
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  • M.A.S. thanks the Max Planck Graduate Center for funding. This work is part of the research programme ‘Understanding the viscoelasticity of elastomer based nanocomposites’ (11VEC01) of the ‘Stichting voor Fundamenteel Onderzoek der Materie (FOM)’, which is financially supported by the ‘Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)’.
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