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Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State

Nanocomposite systems comprised of a poly(ethylene vinyl acetate) (EVA) matrix and carbon black (CB) or graphene nanoplatelets (GNPs) were used to investigate conductivity and crystallisation dynamics using a commercially relevant melt-state mixing process. Crystallisation kinetics and morphology, a...

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Autores principales: Stalmann, Gertrud, Matic, Aleksandar, Jacobsson, Per, Tranchida, Davide, Gitsas, Antonis, Gkourmpis, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9612297/
https://www.ncbi.nlm.nih.gov/pubmed/36296791
http://dx.doi.org/10.3390/nano12203602
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author Stalmann, Gertrud
Matic, Aleksandar
Jacobsson, Per
Tranchida, Davide
Gitsas, Antonis
Gkourmpis, Thomas
author_facet Stalmann, Gertrud
Matic, Aleksandar
Jacobsson, Per
Tranchida, Davide
Gitsas, Antonis
Gkourmpis, Thomas
author_sort Stalmann, Gertrud
collection PubMed
description Nanocomposite systems comprised of a poly(ethylene vinyl acetate) (EVA) matrix and carbon black (CB) or graphene nanoplatelets (GNPs) were used to investigate conductivity and crystallisation dynamics using a commercially relevant melt-state mixing process. Crystallisation kinetics and morphology, as investigated by DSC and SEM, turn out to depend on the interplay of (i) the interphase interactions between matrix and filler, and (ii) the degree of filler agglomeration. For the GNP-based systems, an almost constant conductivity value was observed for all compositions upon cooling, something not observed for the CB-based compositions. These conductivity changes reflect structural and morphological changes that can be associated with positive and negative thermal expansion coefficients. GNP-based systems were observed to exhibit a percolation threshold of approximately 2.2 vol%, lower than the 4.4 vol% observed for the CB-based systems.
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spelling pubmed-96122972022-10-28 Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State Stalmann, Gertrud Matic, Aleksandar Jacobsson, Per Tranchida, Davide Gitsas, Antonis Gkourmpis, Thomas Nanomaterials (Basel) Article Nanocomposite systems comprised of a poly(ethylene vinyl acetate) (EVA) matrix and carbon black (CB) or graphene nanoplatelets (GNPs) were used to investigate conductivity and crystallisation dynamics using a commercially relevant melt-state mixing process. Crystallisation kinetics and morphology, as investigated by DSC and SEM, turn out to depend on the interplay of (i) the interphase interactions between matrix and filler, and (ii) the degree of filler agglomeration. For the GNP-based systems, an almost constant conductivity value was observed for all compositions upon cooling, something not observed for the CB-based compositions. These conductivity changes reflect structural and morphological changes that can be associated with positive and negative thermal expansion coefficients. GNP-based systems were observed to exhibit a percolation threshold of approximately 2.2 vol%, lower than the 4.4 vol% observed for the CB-based systems. MDPI 2022-10-14 /pmc/articles/PMC9612297/ /pubmed/36296791 http://dx.doi.org/10.3390/nano12203602 Text en © 2022 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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Stalmann, Gertrud
Matic, Aleksandar
Jacobsson, Per
Tranchida, Davide
Gitsas, Antonis
Gkourmpis, Thomas
Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State
title Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State
title_full Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State
title_fullStr Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State
title_full_unstemmed Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State
title_short Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State
title_sort crystallisation kinetics and associated electrical conductivity dynamics of poly(ethylene vinyl acetate) nanocomposites in the melt state
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9612297/
https://www.ncbi.nlm.nih.gov/pubmed/36296791
http://dx.doi.org/10.3390/nano12203602
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