Tuning Structure and Rheology of Silica-Latex Nanocomposites with the Molecular Weight of Matrix Chains: A Coupled SAXS-TEM-Simulation Approach
| Autor: | Christelle Dupas, Julian Oberdisse, Mathieu Chirat, Anne-Caroline Genix, Sylvain Caillol, Amélie Banc, Michael Sztucki |
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| Přispěvatelé: | Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), European Synchrotron Radiation Facility (ESRF), Matière Molle, Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanocomposite Polymers and Plastics Small-angle X-ray scattering Diffusion Organic Chemistry Nanoparticle FOS: Physical sciences Percolation threshold Polymer Condensed Matter - Soft Condensed Matter [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Inorganic Chemistry Condensed Matter::Soft Condensed Matter chemistry Rheology Chemical engineering Materials Chemistry Soft Condensed Matter (cond-mat.soft) Dispersion (chemistry) [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Macromolecules Macromolecules, American Chemical Society, 2014, 47 (9), pp.3219-3230. ⟨10.1021/ma500465n⟩ |
| ISSN: | 0024-9297 1520-5835 |
| DOI: | 10.48550/arxiv.1405.5411 |
| Popis: | International audience; The structure of silica-latex nanocomposites of three matrix chain masses (20, 50, and 160 kg/mol of poly(ethyl methacrylate)) are studied using a SAXS/TEM approach, coupled via Monte Carlo simulations of scattering of fully polydisperse silica nanoparticle aggregates. At low silica concentrations (1 vol. %), the impact of the matrix chain mass on the structure is quantified in terms of the aggregation number distribution function, highest mass leading to individual dispersion, whereas the lower masses favor the formation of small aggregates. Both simulations for SAXS and TEM give compatible aggregate compacities around 10 vol. %, indicating that the construction algorithm for aggregates is realistic. Our results on structure are rationalized in terms of the critical collision time between nanoparticles due to diffusion in viscous matrices. At higher concentrations, aggregates overlap and form a percolated network, with a smaller and lighter mesh in the presence of high mass polymers. The linear rheology is investigated with oscillatory shear experiments. It shows a feature related to the silica structure at low frequencies, the amplitude of which can be described by two power laws separated by the percolation threshold of aggregates. |
| Databáze: | OpenAIRE |
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