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Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior

With a view to the development of new sustainable and functional adhesives, two Diels–Alder (DA) adducts are incorporated as a third component into the curing process of solvent-based and solvent-free polyurethanes in this study. The influence of the nature and content of the DA molecules on the ret...

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Autores principales: Quiles-Díaz, Susana, Seyler, Helga, Ellis, Gary J., Shuttleworth, Peter S., Flores, Araceli, Gómez-Fatou, Marián A., Salavagione, Horacio J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414518/
https://www.ncbi.nlm.nih.gov/pubmed/36015659
http://dx.doi.org/10.3390/polym14163402
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author Quiles-Díaz, Susana
Seyler, Helga
Ellis, Gary J.
Shuttleworth, Peter S.
Flores, Araceli
Gómez-Fatou, Marián A.
Salavagione, Horacio J.
author_facet Quiles-Díaz, Susana
Seyler, Helga
Ellis, Gary J.
Shuttleworth, Peter S.
Flores, Araceli
Gómez-Fatou, Marián A.
Salavagione, Horacio J.
author_sort Quiles-Díaz, Susana
collection PubMed
description With a view to the development of new sustainable and functional adhesives, two Diels–Alder (DA) adducts are incorporated as a third component into the curing process of solvent-based and solvent-free polyurethanes in this study. The influence of the nature and content of the DA molecules on the retro-DA (rDA) reaction and its reversibility and cyclability is investigated. It is demonstrated that the bonding/debonding properties of the adhesives are mainly controlled by the concentration of the DA adducts, with a minimum thermoreversible bond (TB) content required that depends on the system and the total ratio between all the diols in the formulation. For the solvent-based system, rDA/DA reversibility can be repeated up to ~20 times without deterioration, in contrast to the solvent-free system where a gradual loss in the DA network reconstruction efficiency is observed. Despite this limitation, the solvent-free system presents clear advantages from an environmental point of view. The changes observed in the physical properties of these new thermoreversible adhesives are of great relevance for recycling strategies and, in particular, their potential for separating multilayered film packaging materials in order to recycle the individual polymer films involved.
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spelling pubmed-94145182022-08-27 Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior Quiles-Díaz, Susana Seyler, Helga Ellis, Gary J. Shuttleworth, Peter S. Flores, Araceli Gómez-Fatou, Marián A. Salavagione, Horacio J. Polymers (Basel) Article With a view to the development of new sustainable and functional adhesives, two Diels–Alder (DA) adducts are incorporated as a third component into the curing process of solvent-based and solvent-free polyurethanes in this study. The influence of the nature and content of the DA molecules on the retro-DA (rDA) reaction and its reversibility and cyclability is investigated. It is demonstrated that the bonding/debonding properties of the adhesives are mainly controlled by the concentration of the DA adducts, with a minimum thermoreversible bond (TB) content required that depends on the system and the total ratio between all the diols in the formulation. For the solvent-based system, rDA/DA reversibility can be repeated up to ~20 times without deterioration, in contrast to the solvent-free system where a gradual loss in the DA network reconstruction efficiency is observed. Despite this limitation, the solvent-free system presents clear advantages from an environmental point of view. The changes observed in the physical properties of these new thermoreversible adhesives are of great relevance for recycling strategies and, in particular, their potential for separating multilayered film packaging materials in order to recycle the individual polymer films involved. MDPI 2022-08-19 /pmc/articles/PMC9414518/ /pubmed/36015659 http://dx.doi.org/10.3390/polym14163402 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
Quiles-Díaz, Susana
Seyler, Helga
Ellis, Gary J.
Shuttleworth, Peter S.
Flores, Araceli
Gómez-Fatou, Marián A.
Salavagione, Horacio J.
Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior
title Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior
title_full Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior
title_fullStr Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior
title_full_unstemmed Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior
title_short Designing New Sustainable Polyurethane Adhesives: Influence of the Nature and Content of Diels–Alder Adducts on Their Thermoreversible Behavior
title_sort designing new sustainable polyurethane adhesives: influence of the nature and content of diels–alder adducts on their thermoreversible behavior
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414518/
https://www.ncbi.nlm.nih.gov/pubmed/36015659
http://dx.doi.org/10.3390/polym14163402
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