On the Segmental Dynamics and the Glass Transition Behavior of Poly(2-vinylpyridine) in One- and Two-Dimensional Nanometric Confinement
| Autor: | Karolina Adrjanowicz, Roksana Winkler, Wenkang Tu, Aparna Beena Unni, Katarzyna Chat |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Silicon Polymers Thin films chemistry.chemical_element Substrate (electronics) 010402 general chemistry 01 natural sciences Article 0103 physical sciences Materials Chemistry Quantum confinement Physical and Theoretical Chemistry Thin film chemistry.chemical_classification 010304 chemical physics Polymer Insulators Surface energy 0104 chemical sciences Surfaces Coatings and Films Dielectric spectroscopy Nanopore chemistry Chemical physics Glass transition |
| Zdroj: | The Journal of Physical Chemistry. B |
| ISSN: | 1520-5207 |
| Popis: | Geometric nanoconfinement, in one and two dimensions, has a fundamental influence on the segmental dynamics of polymer glass-formers and can be markedly different from that observed in the bulk state. In this work, with the use of dielectric spectroscopy, we have investigated the glass transition behavior of poly(2-vinylpyridine) (P2VP) confined within alumina nanopores and prepared as a thin film supported on a silicon substrate. P2VP is known to exhibit strong, attractive interactions with confining surfaces due to the ability to form hydrogen bonds. Obtained results show no changes in the temperature evolution of the α-relaxation time in nanopores down to 20 nm size and 24 nm thin film. There is also no evidence of an out-of-equilibrium behavior observed for other glass-forming systems confined at the nanoscale. Nevertheless, in both cases, the confinement effect is seen as a substantial broadening of the α-relaxation time distribution. We discussed the results in terms of the importance of the interfacial energy between the polymer and various substrates, the sensitivity of the glass-transition temperature to density fluctuations, and the density scaling concept. |
| Databáze: | OpenAIRE |
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