Cargando…

Phase stability and dynamics of entangled polymer–nanoparticle composites

Nanoparticle–polymer composites, or polymer–nanoparticle composites (PNCs), exhibit unusual mechanical and dynamical features when the particle size approaches the random coil dimensions of the host polymer. Here, we harness favourable enthalpic interactions between particle-tethered and free, host...

Descripción completa

Detalles Bibliográficos
Autores principales: Mangal, Rahul, Srivastava, Samanvaya, Archer, Lynden A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4468852/
https://www.ncbi.nlm.nih.gov/pubmed/26044723
http://dx.doi.org/10.1038/ncomms8198
_version_ 1782376558844968960
author Mangal, Rahul
Srivastava, Samanvaya
Archer, Lynden A.
author_facet Mangal, Rahul
Srivastava, Samanvaya
Archer, Lynden A.
author_sort Mangal, Rahul
collection PubMed
description Nanoparticle–polymer composites, or polymer–nanoparticle composites (PNCs), exhibit unusual mechanical and dynamical features when the particle size approaches the random coil dimensions of the host polymer. Here, we harness favourable enthalpic interactions between particle-tethered and free, host polymer chains to create model PNCs, in which spherical nanoparticles are uniformly dispersed in high molecular weight entangled polymers. Investigation of the mechanical properties of these model PNCs reveals that the nanoparticles have profound effects on the host polymer motions on all timescales. On short timescales, nanoparticles slow-down local dynamics of the host polymer segments and lower the glass transition temperature. On intermediate timescales, where polymer chain motion is typically constrained by entanglements with surrounding molecules, nanoparticles provide additional constraints, which lead to an early onset of entangled polymer dynamics. Finally, on long timescales, nanoparticles produce an apparent speeding up of relaxation of their polymer host.
format Online
Article
Text
id pubmed-4468852
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Nature Pub. Group
record_format MEDLINE/PubMed
spelling pubmed-44688522015-06-30 Phase stability and dynamics of entangled polymer–nanoparticle composites Mangal, Rahul Srivastava, Samanvaya Archer, Lynden A. Nat Commun Article Nanoparticle–polymer composites, or polymer–nanoparticle composites (PNCs), exhibit unusual mechanical and dynamical features when the particle size approaches the random coil dimensions of the host polymer. Here, we harness favourable enthalpic interactions between particle-tethered and free, host polymer chains to create model PNCs, in which spherical nanoparticles are uniformly dispersed in high molecular weight entangled polymers. Investigation of the mechanical properties of these model PNCs reveals that the nanoparticles have profound effects on the host polymer motions on all timescales. On short timescales, nanoparticles slow-down local dynamics of the host polymer segments and lower the glass transition temperature. On intermediate timescales, where polymer chain motion is typically constrained by entanglements with surrounding molecules, nanoparticles provide additional constraints, which lead to an early onset of entangled polymer dynamics. Finally, on long timescales, nanoparticles produce an apparent speeding up of relaxation of their polymer host. Nature Pub. Group 2015-06-05 /pmc/articles/PMC4468852/ /pubmed/26044723 http://dx.doi.org/10.1038/ncomms8198 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. 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
Mangal, Rahul
Srivastava, Samanvaya
Archer, Lynden A.
Phase stability and dynamics of entangled polymer–nanoparticle composites
title Phase stability and dynamics of entangled polymer–nanoparticle composites
title_full Phase stability and dynamics of entangled polymer–nanoparticle composites
title_fullStr Phase stability and dynamics of entangled polymer–nanoparticle composites
title_full_unstemmed Phase stability and dynamics of entangled polymer–nanoparticle composites
title_short Phase stability and dynamics of entangled polymer–nanoparticle composites
title_sort phase stability and dynamics of entangled polymer–nanoparticle composites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4468852/
https://www.ncbi.nlm.nih.gov/pubmed/26044723
http://dx.doi.org/10.1038/ncomms8198
work_keys_str_mv AT mangalrahul phasestabilityanddynamicsofentangledpolymernanoparticlecomposites
AT srivastavasamanvaya phasestabilityanddynamicsofentangledpolymernanoparticlecomposites
AT archerlyndena phasestabilityanddynamicsofentangledpolymernanoparticlecomposites