Volume 53, Issue 5 p. 379-388
Full Paper

Effect of bio-based monomers on the scratch resistance of acrylate photopolymerizable coatings

Emeline Prandato,

Université de Lyon, CNRS, UMR 5223, INSA-Lyon, IMP@INSA, F-69621 Villeurbanne, France

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Sébastien Livi,

Université de Lyon, CNRS, UMR 5223, INSA-Lyon, IMP@INSA, F-69621 Villeurbanne, France

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Michel Melas,

Arkema, Centre de Recherche de l'Oise, Parc Technologique Alata, rue Jacques Taffanel, F-60550 Verneuil en Halatte, France

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Justine Auclair,

Institut de Chimie de Clermont-Ferrand, UMR 6296, Equipe Photochimie, Chimie 6, 24 Avenue des Landais, BP 80026, F-63171 Aubière, France

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Vincent Verney,

Institut de Chimie de Clermont-Ferrand, UMR 6296, Equipe Photochimie, Chimie 6, 24 Avenue des Landais, BP 80026, F-63171 Aubière, France

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Etienne Fleury,

Université de Lyon, CNRS, UMR 5223, INSA-Lyon, IMP@INSA, F-69621 Villeurbanne, France

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Françoise Méchin,

Corresponding Author

Université de Lyon, CNRS, UMR 5223, INSA-Lyon, IMP@INSA, F-69621 Villeurbanne, France

Correspondence to: F. Méchin (E-mail: francoise.mechin@insa-lyon.fr)Search for more papers by this author
First published: 01 December 2014
Citations: 2

ABSTRACT

Photopolymerizable clear coatings based on bio-sourced acrylates, dedicated to the protection of polycarbonate substrates, were studied. The bio-sourced compounds were not based on triglycerides but were smaller, industrially available molecules similar to classical petro-based monomers. Their polymerization kinetics was studied by photo-DSC and was shown to allow high acrylate conversions even at 25 °C. Closely related coatings enriched in alkyl segments, or in monoacrylates to decrease the crosslinking density, were compared. The material composition affects its nanomorphology deduced from X-ray diffraction. Although these changes in composition can slightly shift the mechanical relaxation, it remains wide, and the elastic modulus remains high (>108 Pa) for all the tested materials. Microscratch experiments highlighted the efficiency of all the new coatings in terms of protection against scratches. Incorporating a monoacrylate, particularly isobornyl acrylate, can improve the scratch resistance especially in terms of critical load (up to 175% increase compared with a classical petro-based coating). © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 379–388

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