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Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction

Nanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester poly...

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Autores principales: Chrissopoulou, Kiriaki, Androulaki, Krystalenia, Labardi, Massimiliano, Anastasiadis, Spiros H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8036730/
https://www.ncbi.nlm.nih.gov/pubmed/33805915
http://dx.doi.org/10.3390/polym13071008
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author Chrissopoulou, Kiriaki
Androulaki, Krystalenia
Labardi, Massimiliano
Anastasiadis, Spiros H.
author_facet Chrissopoulou, Kiriaki
Androulaki, Krystalenia
Labardi, Massimiliano
Anastasiadis, Spiros H.
author_sort Chrissopoulou, Kiriaki
collection PubMed
description Nanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester polyols are mixed with graphite oxide (GO) and the favorable interactions between the polymers and the solid surfaces lead to intercalated structure. The thermal transitions of the confined chains are suppressed, whereas their dynamics show similarities and differences with the dynamics of the neat polymers. The three relaxation processes observed for the neat polymers are observed in the nanohybrids as well, but with different temperature dependencies. Thermal reduction of the graphite oxide in the presence of the polymer to produce reduced graphite oxide (rGO) reveals an increase in the reduction temperature, which is accompanied by decreased thermal stability of the polymer. The de-oxygenation of the graphite oxide leads to the destruction of the intercalated structure and to the dispersion of the rGO layers within the polymeric matrix because of the modification of the interactions between the polymer chains and the surfaces. A significant increase in the conductivity of the resulting nanocomposites, in comparison to both the polymers and the intercalated nanohybrids, indicates the formation of a percolated rGO network.
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spelling pubmed-80367302021-04-12 Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction Chrissopoulou, Kiriaki Androulaki, Krystalenia Labardi, Massimiliano Anastasiadis, Spiros H. Polymers (Basel) Article Nanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester polyols are mixed with graphite oxide (GO) and the favorable interactions between the polymers and the solid surfaces lead to intercalated structure. The thermal transitions of the confined chains are suppressed, whereas their dynamics show similarities and differences with the dynamics of the neat polymers. The three relaxation processes observed for the neat polymers are observed in the nanohybrids as well, but with different temperature dependencies. Thermal reduction of the graphite oxide in the presence of the polymer to produce reduced graphite oxide (rGO) reveals an increase in the reduction temperature, which is accompanied by decreased thermal stability of the polymer. The de-oxygenation of the graphite oxide leads to the destruction of the intercalated structure and to the dispersion of the rGO layers within the polymeric matrix because of the modification of the interactions between the polymer chains and the surfaces. A significant increase in the conductivity of the resulting nanocomposites, in comparison to both the polymers and the intercalated nanohybrids, indicates the formation of a percolated rGO network. MDPI 2021-03-25 /pmc/articles/PMC8036730/ /pubmed/33805915 http://dx.doi.org/10.3390/polym13071008 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle Article
Chrissopoulou, Kiriaki
Androulaki, Krystalenia
Labardi, Massimiliano
Anastasiadis, Spiros H.
Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
title Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
title_full Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
title_fullStr Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
title_full_unstemmed Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
title_short Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction
title_sort static and dynamic behavior of polymer/graphite oxide nanocomposites before and after thermal reduction
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8036730/
https://www.ncbi.nlm.nih.gov/pubmed/33805915
http://dx.doi.org/10.3390/polym13071008
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