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Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases
Dynamics of the interphase region between matrix and bound polymers on nanoparticles is important to understand the macroscopic rheological properties of nanocomposites. Here, we present neutron scattering investigations on nanocomposites with dynamically asymmetric interphases formed by a high-glas...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4960532/ https://www.ncbi.nlm.nih.gov/pubmed/27457056 http://dx.doi.org/10.1038/srep29326 |
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author | Senses, Erkan Faraone, Antonio Akcora, Pinar |
author_facet | Senses, Erkan Faraone, Antonio Akcora, Pinar |
author_sort | Senses, Erkan |
collection | PubMed |
description | Dynamics of the interphase region between matrix and bound polymers on nanoparticles is important to understand the macroscopic rheological properties of nanocomposites. Here, we present neutron scattering investigations on nanocomposites with dynamically asymmetric interphases formed by a high-glass transition temperature polymer, poly(methyl methacrylate), adsorbed on nanoparticles and a low-glass transition temperature miscible matrix, poly(ethylene oxide). By taking advantage of selective isotope labeling of the chains, we studied the role of interfacial polymer on segmental and collective dynamics of the matrix chains from subnanoseconds to 100 nanoseconds. Our results show that the Rouse relaxation remains unchanged in a weakly attractive composite system while the dynamics significantly slows down in a strongly attractive composite. More importantly, the chains disentangle with a remarkable increase of the reptation tube size when the bound polymer is vitreous. The glassy and rubbery states of the bound polymer as temperature changes underpin the macroscopic stiffening of nanocomposites. |
format | Online Article Text |
id | pubmed-4960532 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-49605322016-08-05 Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases Senses, Erkan Faraone, Antonio Akcora, Pinar Sci Rep Article Dynamics of the interphase region between matrix and bound polymers on nanoparticles is important to understand the macroscopic rheological properties of nanocomposites. Here, we present neutron scattering investigations on nanocomposites with dynamically asymmetric interphases formed by a high-glass transition temperature polymer, poly(methyl methacrylate), adsorbed on nanoparticles and a low-glass transition temperature miscible matrix, poly(ethylene oxide). By taking advantage of selective isotope labeling of the chains, we studied the role of interfacial polymer on segmental and collective dynamics of the matrix chains from subnanoseconds to 100 nanoseconds. Our results show that the Rouse relaxation remains unchanged in a weakly attractive composite system while the dynamics significantly slows down in a strongly attractive composite. More importantly, the chains disentangle with a remarkable increase of the reptation tube size when the bound polymer is vitreous. The glassy and rubbery states of the bound polymer as temperature changes underpin the macroscopic stiffening of nanocomposites. Nature Publishing Group 2016-07-26 /pmc/articles/PMC4960532/ /pubmed/27457056 http://dx.doi.org/10.1038/srep29326 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Senses, Erkan Faraone, Antonio Akcora, Pinar Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases |
title | Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases |
title_full | Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases |
title_fullStr | Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases |
title_full_unstemmed | Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases |
title_short | Microscopic Chain Motion in Polymer Nanocomposites with Dynamically Asymmetric Interphases |
title_sort | microscopic chain motion in polymer nanocomposites with dynamically asymmetric interphases |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4960532/ https://www.ncbi.nlm.nih.gov/pubmed/27457056 http://dx.doi.org/10.1038/srep29326 |
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