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Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging

This work aimed to monitor, through the changes in electrical resistance, the evolution of the mechanical properties due to aging caused by water sorption in carbon nanotube-based epoxy composites. The epoxy/CNT nanocomposites were prepared by dispersing the filler in the precursor through the ultra...

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Autores principales: Guadagno, Liberata, Vertuccio, Luigi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8465806/
https://www.ncbi.nlm.nih.gov/pubmed/34578499
http://dx.doi.org/10.3390/nano11092183
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author Guadagno, Liberata
Vertuccio, Luigi
author_facet Guadagno, Liberata
Vertuccio, Luigi
author_sort Guadagno, Liberata
collection PubMed
description This work aimed to monitor, through the changes in electrical resistance, the evolution of the mechanical properties due to aging caused by water sorption in carbon nanotube-based epoxy composites. The epoxy/CNT nanocomposites were prepared by dispersing the filler in the precursor through the ultra-sonication process and mixing the hardener by mechanical stirring. After an evaluation of the electrical properties, detected through a two-probe electrical measurement method, of nanocomposites at different percentages by weight of the filler (0.025, 0.05, 0.1, 0.3, 0.5, and 1.0), a concentration (0.1% by weight), close to that of the electrical percolation threshold, was chosen to evaluate the resistive response. This specific concentration was selected in order to obtain maximized values of the variation detected for the changes in the electrical resistance resulting from phenomena of structural relaxations/rearrangements due to water absorption. In particular, the electrical conductivity value switched from 8.2 × 10(−14) S/m for the unfilled epoxy resin to 6.3 × 10(−2) S/m for carbon nanotube-based epoxy composite at 0.1% by weight of the nanofiller. The water sorption caused a reduction in the mechanical properties (storage modulus and tan δ) due to swelling and plasticization phenomena, which caused the structural reorganization of the conductive interparticle contacts in the matrix with a consequent variation in the electrical resistance of the material. The found ‘non-Fickian’ water diffusion behavior was very similar to the variation in the electrical resistance with time. This last correlation allows the association of the measurement of the electrical resistance with the quantity of absorbed water and, therefore, with the aging of the material to water absorption, through the sensitivity factor (β). The resistive nature of the composite can be used to monitor the amount of water absorption and the changes in the structure of the material subject to water aging.
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spelling pubmed-84658062021-09-27 Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging Guadagno, Liberata Vertuccio, Luigi Nanomaterials (Basel) Article This work aimed to monitor, through the changes in electrical resistance, the evolution of the mechanical properties due to aging caused by water sorption in carbon nanotube-based epoxy composites. The epoxy/CNT nanocomposites were prepared by dispersing the filler in the precursor through the ultra-sonication process and mixing the hardener by mechanical stirring. After an evaluation of the electrical properties, detected through a two-probe electrical measurement method, of nanocomposites at different percentages by weight of the filler (0.025, 0.05, 0.1, 0.3, 0.5, and 1.0), a concentration (0.1% by weight), close to that of the electrical percolation threshold, was chosen to evaluate the resistive response. This specific concentration was selected in order to obtain maximized values of the variation detected for the changes in the electrical resistance resulting from phenomena of structural relaxations/rearrangements due to water absorption. In particular, the electrical conductivity value switched from 8.2 × 10(−14) S/m for the unfilled epoxy resin to 6.3 × 10(−2) S/m for carbon nanotube-based epoxy composite at 0.1% by weight of the nanofiller. The water sorption caused a reduction in the mechanical properties (storage modulus and tan δ) due to swelling and plasticization phenomena, which caused the structural reorganization of the conductive interparticle contacts in the matrix with a consequent variation in the electrical resistance of the material. The found ‘non-Fickian’ water diffusion behavior was very similar to the variation in the electrical resistance with time. This last correlation allows the association of the measurement of the electrical resistance with the quantity of absorbed water and, therefore, with the aging of the material to water absorption, through the sensitivity factor (β). The resistive nature of the composite can be used to monitor the amount of water absorption and the changes in the structure of the material subject to water aging. MDPI 2021-08-25 /pmc/articles/PMC8465806/ /pubmed/34578499 http://dx.doi.org/10.3390/nano11092183 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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Guadagno, Liberata
Vertuccio, Luigi
Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging
title Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging
title_full Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging
title_fullStr Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging
title_full_unstemmed Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging
title_short Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging
title_sort resistive response of carbon nanotube-based composites subjected to water aging
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8465806/
https://www.ncbi.nlm.nih.gov/pubmed/34578499
http://dx.doi.org/10.3390/nano11092183
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