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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...

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Detalles Bibliográficos
Autores principales: Senses, Erkan, Faraone, Antonio, Akcora, Pinar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
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.
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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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