Incorporation of silica nanocontainers and its impact on a waterborne polyurethane coating
Pierre Loison
Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Durabilité, Microstructure, Protection et Revêtements (DMPR), Université de La Rochelle, La Rochelle Cedex, France
Ingénierie de surface et collage, ArianeGroup, Saint-Médard-en-Jalles, France
Search for more papers by this authorVincent Debout
Ingénierie de surface et collage, ArianeGroup, Saint-Médard-en-Jalles, France
Search for more papers by this authorHugo Groult
LIttoral Environnement Sociétés, UMR 7266 CNRS, Biotechnologies et Chimie des Bioressources pour la Santé (BCBS) Université de La Rochelle, La Rochelle Cedex, France
Search for more papers by this authorCorresponding Author
Juan Creus
Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Durabilité, Microstructure, Protection et Revêtements (DMPR), Université de La Rochelle, La Rochelle Cedex, France
Correspondence Juan Creus, Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Université de La Rochelle, Avenue Michel Crépeau, 17000 La Rochelle Cedex 1, France. Email: [email protected]
Search for more papers by this authorSébastien Touzain
Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Durabilité, Microstructure, Protection et Revêtements (DMPR), Université de La Rochelle, La Rochelle Cedex, France
Search for more papers by this authorPierre Loison
Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Durabilité, Microstructure, Protection et Revêtements (DMPR), Université de La Rochelle, La Rochelle Cedex, France
Ingénierie de surface et collage, ArianeGroup, Saint-Médard-en-Jalles, France
Search for more papers by this authorVincent Debout
Ingénierie de surface et collage, ArianeGroup, Saint-Médard-en-Jalles, France
Search for more papers by this authorHugo Groult
LIttoral Environnement Sociétés, UMR 7266 CNRS, Biotechnologies et Chimie des Bioressources pour la Santé (BCBS) Université de La Rochelle, La Rochelle Cedex, France
Search for more papers by this authorCorresponding Author
Juan Creus
Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Durabilité, Microstructure, Protection et Revêtements (DMPR), Université de La Rochelle, La Rochelle Cedex, France
Correspondence Juan Creus, Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Université de La Rochelle, Avenue Michel Crépeau, 17000 La Rochelle Cedex 1, France. Email: [email protected]
Search for more papers by this authorSébastien Touzain
Laboratoire des Sciences de l'Ingénieur pour l'Environnement, UMR 7356 CNRS, Durabilité, Microstructure, Protection et Revêtements (DMPR), Université de La Rochelle, La Rochelle Cedex, France
Search for more papers by this authorAbstract
In the present work, we describe the development and characterization of a versatile smart coating containing an encapsulated inhibitor. This includes the synthesis and characterization of hollow spherical nanocapsules with diameters ranging from 180 to 200 nm. These particles are able to release their payload when exposed to an alkaline environment, what could be induced by corrosion-linked processes. A corrosion inhibitor, namely 2-mercaptobenzothiazole has been encapsulated, after what the capsules were incorporated in a polyurethane (PU) matrix; optimization of the process led to homogeneous coatings with a good dispersion of silica assessed by micro-fluorescence spectroscopy. Electrochemical impedance spectroscopy highlighted a negative effect of the capsules’ addition to the PU network, affecting the coating's barrier properties. However, the release of the inhibitor upon water ingress in the coating and potential short-term protection was seen. Nevertheless, tests conducted on coatings with artificial defects could not lead to a reduction of the corrosion rate, probably due to the large size of the defects.
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