Thermomechanical Properties and Glass Dynamics of Polymer-Tethered Colloidal Particles and Films
| Autor: | Krzysztof Matyjaszewski, Jiajun Yan, Pascal Rembert, Zhang Jian'an, Anna N. Reuss, Yu Cang, R. Sainidou, Jaejun Lee, Elena Alonso-Redondo, George Fytas, Michael R. Bockstaller |
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| Přispěvatelé: | Carnegie Mellon University [Pittsburgh] (CMU), Laboratoire Ondes et Milieux Complexes (LOMC), Centre National de la Recherche Scientifique (CNRS)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Normandie Université (NU), Max Planck Institute for Polymer Research, Max-Planck-Gesellschaft |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Polymers Nanotechnology 02 engineering and technology Quantum entanglement 010402 general chemistry digestive system 01 natural sciences Article Light scattering law.invention Inorganic Chemistry Engineering law Materials Chemistry ComputingMilieux_MISCELLANEOUS chemistry.chemical_classification [PHYS]Physics [physics] Range (particle radiation) Quantitative Biology::Biomolecules Organic Chemistry Brush Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Brillouin zone Condensed Matter::Soft Condensed Matter Computer Science::Graphics chemistry Chemical physics Chemical Sciences Relaxation (physics) Particle 0210 nano-technology |
| Zdroj: | Macromolecules, vol 50, iss 21 Macromolecules Macromolecules, American Chemical Society, 2017, 50 (21), pp.8658-8669. ⟨10.1021/acs.macromol.7b01752⟩ |
| ISSN: | 0024-9297 1520-5835 |
| Popis: | Polymer-tethered colloidal particles (aka "particle brush materials") have attracted interest as a platform for innovative material technologies and as a model system to elucidate glass formation in complex structured media. In this contribution, Brillouin light scattering is used to sequentially evaluate the role of brush architecture on the dynamical properties of brush particles in both the individual and assembled (film) state. In the former state, the analysis reveals that brush-brush interactions as well as global chain relaxation sensitively depend on grafting density; i.e., more polymer-like behavior is observed in sparse brush systems. This is interpreted to be a consequence of more extensive chain entanglement. In contrast, the local relaxation of films does not depend on grafting density. The results highlight that relaxation processes in particle brush-based materials span a wider range of time and length scales as compared to linear chain polymers. Differentiation between relaxation on local and global scale is necessary to reveal the influence of molecular structure and connectivity on the aging behavior of these complex systems. |
| Databáze: | OpenAIRE |
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