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Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry
This study examines the preparation of electrically conductive polymer networks based on furan-functionalised polyketone (PK-Fu) doped with multi-walled carbon nanotubes (MWCNTs) and reversibly crosslinked with bis-maleimide (B-Ma) via Diels-Alder (DA) cycloaddition. Notably, the incorporation of 5...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403874/ https://www.ncbi.nlm.nih.gov/pubmed/30961001 http://dx.doi.org/10.3390/polym10101076 |
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author | Araya-Hermosilla, Rodrigo Pucci, Andrea Raffa, Patrizio Santosa, Dian Pescarmona, Paolo P. Gengler, Régis Y. N. Rudolf, Petra Moreno-Villoslada, Ignacio Picchioni, Francesco |
author_facet | Araya-Hermosilla, Rodrigo Pucci, Andrea Raffa, Patrizio Santosa, Dian Pescarmona, Paolo P. Gengler, Régis Y. N. Rudolf, Petra Moreno-Villoslada, Ignacio Picchioni, Francesco |
author_sort | Araya-Hermosilla, Rodrigo |
collection | PubMed |
description | This study examines the preparation of electrically conductive polymer networks based on furan-functionalised polyketone (PK-Fu) doped with multi-walled carbon nanotubes (MWCNTs) and reversibly crosslinked with bis-maleimide (B-Ma) via Diels-Alder (DA) cycloaddition. Notably, the incorporation of 5 wt.% of MWCNTs results in an increased modulus of the material, and makes it thermally and electrically conductive. Analysis by X-ray photoelectron spectroscopy indicates that MWCNTs, due to their diene/dienophile character, covalently interact with the matrix via DA reaction, leading to effective interfacial adhesion between the components. Raman spectroscopy points to a more effective graphitic ordering of MWCNTs after reaction with PK-Fu and B-Ma. After crosslinking the obtained composite via the DA reaction, the softening point (tan(δ) in dynamic mechanical analysis measurements) increases up to 155 °C, as compared to the value of 130 °C for the PK-Fu crosslinked with B-Ma and that of 140 °C for the PK-Fu/B-Ma/MWCNT nanocomposite before resistive heating (responsible for crosslinking). After grinding the composite, compression moulding (150 °C/40 bar) activates the retro-DA process that disrupts the network, allowing it to be reshaped as a thermoplastic. A subsequent process of annealing via resistive heating demonstrates the possibility of reconnecting the decoupled DA linkages, thus providing the PK networks with the same thermal, mechanical, and electrical properties as the crosslinked pristine systems. |
format | Online Article Text |
id | pubmed-6403874 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-64038742019-04-02 Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry Araya-Hermosilla, Rodrigo Pucci, Andrea Raffa, Patrizio Santosa, Dian Pescarmona, Paolo P. Gengler, Régis Y. N. Rudolf, Petra Moreno-Villoslada, Ignacio Picchioni, Francesco Polymers (Basel) Article This study examines the preparation of electrically conductive polymer networks based on furan-functionalised polyketone (PK-Fu) doped with multi-walled carbon nanotubes (MWCNTs) and reversibly crosslinked with bis-maleimide (B-Ma) via Diels-Alder (DA) cycloaddition. Notably, the incorporation of 5 wt.% of MWCNTs results in an increased modulus of the material, and makes it thermally and electrically conductive. Analysis by X-ray photoelectron spectroscopy indicates that MWCNTs, due to their diene/dienophile character, covalently interact with the matrix via DA reaction, leading to effective interfacial adhesion between the components. Raman spectroscopy points to a more effective graphitic ordering of MWCNTs after reaction with PK-Fu and B-Ma. After crosslinking the obtained composite via the DA reaction, the softening point (tan(δ) in dynamic mechanical analysis measurements) increases up to 155 °C, as compared to the value of 130 °C for the PK-Fu crosslinked with B-Ma and that of 140 °C for the PK-Fu/B-Ma/MWCNT nanocomposite before resistive heating (responsible for crosslinking). After grinding the composite, compression moulding (150 °C/40 bar) activates the retro-DA process that disrupts the network, allowing it to be reshaped as a thermoplastic. A subsequent process of annealing via resistive heating demonstrates the possibility of reconnecting the decoupled DA linkages, thus providing the PK networks with the same thermal, mechanical, and electrical properties as the crosslinked pristine systems. MDPI 2018-09-28 /pmc/articles/PMC6403874/ /pubmed/30961001 http://dx.doi.org/10.3390/polym10101076 Text en © 2018 by the authors. 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/). |
spellingShingle | Article Araya-Hermosilla, Rodrigo Pucci, Andrea Raffa, Patrizio Santosa, Dian Pescarmona, Paolo P. Gengler, Régis Y. N. Rudolf, Petra Moreno-Villoslada, Ignacio Picchioni, Francesco Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry |
title | Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry |
title_full | Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry |
title_fullStr | Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry |
title_full_unstemmed | Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry |
title_short | Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry |
title_sort | electrically-responsive reversible polyketone/mwcnt network through diels-alder chemistry |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403874/ https://www.ncbi.nlm.nih.gov/pubmed/30961001 http://dx.doi.org/10.3390/polym10101076 |
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