Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency

Wood is increasingly used in construction for the benefits it brings to occupants and for its ecological aspect. Indoor wood products are frequently subject to mechanical aggressions, their abrasion and scratch resistance thus need to be improved. The coating system ensures the wood surface protecti...

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Autores principales:	Chloé Paquet, Stephen Brown, Jolanta E. Klemberg-Sapieha, Jean-François Morin, Véronic Landry
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	acrylate UV curable self-healing hydrogen bonds crosslinking Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/c4507b3e4dcf4da19003948dcd291f90
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spelling	oai:doaj.org-article:c4507b3e4dcf4da19003948dcd291f902021-11-25T17:16:07ZSelf-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency10.3390/coatings111113282079-6412https://doaj.org/article/c4507b3e4dcf4da19003948dcd291f902021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1328https://doaj.org/toc/2079-6412Wood is increasingly used in construction for the benefits it brings to occupants and for its ecological aspect. Indoor wood products are frequently subject to mechanical aggressions, their abrasion and scratch resistance thus need to be improved. The coating system ensures the wood surface protection, which is, for wood flooring, a multilayer acrylate UV-curable 100% solid system. To increase the service life of wood flooring, a new property is studied: self-healing. The objective of this study is to observe the impact of monomer structure on self-healing efficiency and the effect of self-healing parameters. A previous formulation was developed using hydrogen bond technology to generate the self-healing property. In this paper, the assessment of the formulation and the self-healing parameters’ impact on self-healing efficiency as well as the physicochemical properties are presented. The composition of the monomer part in the formulations was varied, and the effect on the conversion yield (measured by FT-IR), on the T<sub>g</sub> and crosslinking density (measured by DMA) and on mechanical resistance (evaluated via hardness pendulum, indentation, and reverse impact) was analyzed. The self-healing efficiency of the coatings was determined by gloss and scratch depth measurements (under constant and progressive load). It was proven that monomers with three acrylate functions bring too much crosslinking, which inhibits the chain mobility necessary to observe self-healing. The presence of the AHPMA monomer in the formulation permits considerably increasing the crosslinking density (CLD) while keeping good self-healing efficiency. It was also observed that the self-healing behavior of the coatings is different according to the damage caused. Indeed, the self-healing results after abrasion and after scratch (under constant or progressive load) are different. In conclusion, it is possible to increase CLD while keeping self-healing behavior until a certain limit and with a linear monomer structure to avoid steric hindrance. Moreover, the selection of the best coatings (the one with the highest self-healing) depends on the damage.Chloé PaquetStephen BrownJolanta E. Klemberg-SapiehaJean-François MorinVéronic LandryMDPI AGarticleacrylateUV curableself-healinghydrogen bondscrosslinkingEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1328, p 1328 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	acrylate UV curable self-healing hydrogen bonds crosslinking Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	acrylate UV curable self-healing hydrogen bonds crosslinking Engineering (General). Civil engineering (General) TA1-2040 Chloé Paquet Stephen Brown Jolanta E. Klemberg-Sapieha Jean-François Morin Véronic Landry Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency
description	Wood is increasingly used in construction for the benefits it brings to occupants and for its ecological aspect. Indoor wood products are frequently subject to mechanical aggressions, their abrasion and scratch resistance thus need to be improved. The coating system ensures the wood surface protection, which is, for wood flooring, a multilayer acrylate UV-curable 100% solid system. To increase the service life of wood flooring, a new property is studied: self-healing. The objective of this study is to observe the impact of monomer structure on self-healing efficiency and the effect of self-healing parameters. A previous formulation was developed using hydrogen bond technology to generate the self-healing property. In this paper, the assessment of the formulation and the self-healing parameters’ impact on self-healing efficiency as well as the physicochemical properties are presented. The composition of the monomer part in the formulations was varied, and the effect on the conversion yield (measured by FT-IR), on the T<sub>g</sub> and crosslinking density (measured by DMA) and on mechanical resistance (evaluated via hardness pendulum, indentation, and reverse impact) was analyzed. The self-healing efficiency of the coatings was determined by gloss and scratch depth measurements (under constant and progressive load). It was proven that monomers with three acrylate functions bring too much crosslinking, which inhibits the chain mobility necessary to observe self-healing. The presence of the AHPMA monomer in the formulation permits considerably increasing the crosslinking density (CLD) while keeping good self-healing efficiency. It was also observed that the self-healing behavior of the coatings is different according to the damage caused. Indeed, the self-healing results after abrasion and after scratch (under constant or progressive load) are different. In conclusion, it is possible to increase CLD while keeping self-healing behavior until a certain limit and with a linear monomer structure to avoid steric hindrance. Moreover, the selection of the best coatings (the one with the highest self-healing) depends on the damage.
format	article
author	Chloé Paquet Stephen Brown Jolanta E. Klemberg-Sapieha Jean-François Morin Véronic Landry
author_facet	Chloé Paquet Stephen Brown Jolanta E. Klemberg-Sapieha Jean-François Morin Véronic Landry
author_sort	Chloé Paquet
title	Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency
title_short	Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency
title_full	Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency
title_fullStr	Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency
title_full_unstemmed	Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency
title_sort	self-healing uv-curable acrylate coatings for wood finishing system, part 2: impact of monomer structure and self-healing parameters on self-healing efficiency
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c4507b3e4dcf4da19003948dcd291f90
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Self-Healing UV-Curable Acrylate Coatings for Wood Finishing System, Part 2: Impact of Monomer Structure and Self-Healing Parameters on Self-Healing Efficiency

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