Effect of grafting on rheology and structure of a simplified industrial nanocomposite silica/SBR
| Autor: | Ralf Schweins, Laurent Petitjean, Anne-Caroline Genix, Christophe Degrandcourt, Guilhem P. Baeza, Marc Couty, Julian Oberdisse, Jérémie Gummel |
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| Přispěvatelé: | Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matière Molle, Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique des Verres, Centre de Technologie de Ladoux, Société Michelin, European Synchrotron Radiation Facility (ESRF), Institut Laue-Langevin (ILL), ILL, CIFRE Michelin |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Polymers and Plastics Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry Rheology Materials Chemistry SBR Precipitated silica Nanocomposite Small-angle X-ray scattering Organic Chemistry Silica SAXS 021001 nanoscience & nanotechnology Microstructure grafting 0104 chemical sciences Chemical engineering Transmission electron microscopy Volume fraction tire rheology 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Macromolecules Macromolecules, American Chemical Society, 2013, 46 (16), pp.6621-6633. ⟨10.1021/ma401016d⟩ |
| ISSN: | 0024-9297 1520-5835 |
| DOI: | 10.1021/ma401016d⟩ |
| Popis: | International audience; An un-cross-linked SBR-system filled with precipitated silica nanoparticles of radius ≈10 nm by mixing is studied as a function of the fraction of graftable matrix chains (140 kg mol-1) varying from 0% to 100%, for a low (ΦSi = 8.5 vol %) and high (16.7 vol %) silica volume fraction. The linear rheology in shear shows a strong impact of the grafting on the terminal flow regime, and a shift to longer relaxation times with increasing grafting. Simultaneously, the plateau modulus stays approximately constant for the low ΦSi, suggesting a link to the silica content. The microstructure of the silica is characterized by using a combination of transmission electron microscopy and small-angle X-ray scattering data. We apply a quantitative model of interacting aggregates, and determine the average aggregation number (decreasing from 160 to 30 with grafting), aggregate size (50 to 30 nm), and compacity (55% to 35%). While the linear rheology seems to be dominated by the matrix composition, both the mixing rheology and the structure display a saturation with increasing grafting fraction. A closer analysis of this effect indicates that a critical amount of grafting is needed to trigger structural evolution. To summarize, a quantitative study of complex nanocomposites with several features of industrial systems demonstrates that the grafting density can be used as a fine-tuning parameter of rheology and microstructure. |
| Databáze: | OpenAIRE |
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