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Multiscale Effects of Interfacial Polymer Confinement in Silica Nanocomposites Public Deposited

https://ir.library.oregonstate.edu/concern/articles/fx719s374

This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society and can be found at:  http://pubs.acs.org/doi/10.1021/acs.macromol.5b01111

Access to this item has been restricted by repository administrators at the request of the publisher, American Chemical Society, until October 26, 2016.

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Abstract
  • 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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Funding Statement (additional comments about funding)
  • 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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