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Low-Field NMR Investigations of Nanocomposites: Polymer Dynamics and Network Effects
Open accessAbstract
The dynamics of the polymer matrix in filled rubbers is modified by the presence of solid particles. We used low-field proton NMR to investigate model filled samples consisting of a dispersion of grafted silica particles into an elastomeric matrix. Exploiting magic-sandwich echo experiments, we were able to determine the fraction of polymer with slower dynamics and to correlate it to the silica specific surface. The presence of immobilized polymer─most probably due to a gradient of glass transition temperature around the solid particles─is detected whether there is a covalent bond between the filler and the matrix or not. Moreover, the fraction of immobilized polymer decreases in similar ways with either an increase of the temperature or the addition of solvent. In the case of covalent bonds between the silica and the polymer, multiple-quantum experiments reveal that the cross-link density of the elastomer matrix is locally increased in the vicinity of the particles. This is an observation that was not made in any conventional filled elastomer system and it can be attributed to the good particle dispersion and the covalent links in our model samples.
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“For the polymer melts interacting with a confining surface, they found an anchored surface layer with internal high mobility, which was considered to be glassy in past works [370,376].”
From Challenges in Multiscale Modeling of Polymer Dynamics (2013) · cites this paper as [376]
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“On the one hand, both experimental and computational results have suggested that a mobility gradient exists near the surface of nanoparticles (NPs) on a small, sub-chain-length scale [370,376,377].”
From Challenges in Multiscale Modeling of Polymer Dynamics (2013) · cites this paper as [376]
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Metadata
- Authors
- Papon, A., Saalwächter, K., Schäler, K., Guy, L., Lequeux, F., & Montes, H.
- Affiliations
- PPMD-SIMM, Soft Matter Science and Engineering, UMR 7615 CNRS/UPMC/ESPCI ParisTech, 10 rue Vauquelin, F-75231, Paris Cedex 5, France
- Institut für Physik−NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Strasse 7, D-06120 Halle, Germany
- Rhodia Opérations, 15 rue Pierre Pays, BP 52, F-69660 Collonges-au-Mont-d’Or, France
- ORCID
- Guy, Laurent
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-01-21
- Volume
- 44
- Issue
- 4
- Pages
- 913-922
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W1991037488
- Cited by
- 267
- References
- 37
- Citations by year
- 2026: 17 · 2025: 19 · 2024: 22 · 2023: 11 · 2022: 18 · 2021: 18 · 2020: 18 · 2019: 17 · 2018: 12 · 2017: 19 · 2016: 24 · 2015: 20 · 2014: 19 · 2013: 11 · 2012: 14
- FWCI
- 8.65
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Macromolecules (publishedVersion, other-oa)
- Topics
- Physical Sciences › Chemistry › Spectroscopy › NMR spectroscopy and applications
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer Nanocomposites and Properties
- Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
- Keywords
- filled elastomers, polymer dynamics, silica particles, crosslink density, multiple-quantum NMR, particle dispersion, solvent effects
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