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...
Autores principales: | , , |
---|---|
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 |