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Title: Reversible imine crosslinking in waterborne self-healing polymer coatings
Author: Martins, Tiago D.
Viciosa, M. Teresa
Oliveira, Mariana B.
Fernandes, Auguste
Mano, João F.
Baleizão, Carlos
Farinha, José Paulo S.
Keywords: Polymer nanoparticles
Waterborne polymer coatings
Dynamic covalent bonds
Imine bond formation
Issue Date: Jul-2023
Publisher: Elsevier
Abstract: Waterborne polymer coatings have the potential to address the environmental concerns associated with solvent based systems. To improve their performance without using volatile organic compounds, we propose a new approach based on reconfigurable covalent crosslinking that provides mechanical resistance and self-healing properties. The new waterborne polymer coatings are based on mixtures of aldehyde- and amine-functionalized polymer nanoparticles (PNPs) that take advantage of the reversibility of imine bonds in the presence of water. Different degrees of functional monomer incorporation (10 % to 40 %) allowed us to balance crosslinking and interdiffusion during film formation, to obtain mechanically robust and solvent resistant films. A clear structure-properties relation was assessed by following the formation of water resulting from amine-aldehyde condensation crosslinking, measured by differential scanning calorimetry. The resulting polymer coatings further show self-healing properties at room temperature, triggered with residual amounts of water and featuring high recovery rates of the mechanical properties. Our mechanically robust waterborne polymer coatings based in imine reversible crosslinking, featuring self-healing in mild conditions, offer excellent prospects for application in smart coating materials.
Peer review: yes
DOI: 10.1016/j.porgcoat.2023.107552
ISSN: 0300-9440
Appears in Collections:CICECO - Artigos
DQ - Artigos

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