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Open AccessArticle

Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin

1
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, Americo Vespucio 49, Isla de la Cartuja, E-41092 Sevilla, Spain
2
Instituto de Hortofruticultura Subtropical y Mediterránea (ISM)-La Mayora, Departamento de Mejora Genética y Biotecnología (CSIC), Algarrobo-Costa, E-29750 Málaga, Spain
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(4), 942; https://doi.org/10.3390/polym12040942
Received: 9 March 2020 / Revised: 12 April 2020 / Accepted: 16 April 2020 / Published: 18 April 2020
(This article belongs to the Special Issue Sustainable Bio-Based Polymers: Towards a Circular Bioeconomy)
Metals used for food canning such as aluminum (Al), chromium-coated tin-free steel (TFS) and electrochemically tin-plated steel (ETP) were coated with a 2–3-µm-thick layer of polyaleuritate, the polyester resulting from the self-esterification of naturally-occurring 9,10,16-trihydroxyhexadecanoic (aleuritic) acid. The kinetic of the esterification was studied by FTIR spectroscopy; additionally, the catalytic activity of the surface layer of chromium oxide on TFS and, in particular, of tin oxide on ETP, was established. The texture, gloss and wettability of coatings were characterized by AFM, UV-Vis total reflectance and static water contact angle (WCA) measurements. The resistance of the coatings to solvents was also determined and related to the fraction of unreacted polyhydroxyacid. The occurrence of an oxidative diol cleavage reaction upon preparation in air induced a structural modification of the polyaleuritate layer and conferred upon it thermal stability and resistance to solvents. The promoting effect of the tin oxide layer in such an oxidative cleavage process fosters the potential of this methodology for the design of effective long-chain polyhydroxyester coatings on ETP. View Full-Text
Keywords: bio-based polymers; fatty polyhydroxyesters; can coatings; esterification kinetics; melt-polycondensation bio-based polymers; fatty polyhydroxyesters; can coatings; esterification kinetics; melt-polycondensation
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MDPI and ACS Style

Benítez, J.J.; Osbild, S.; Guzman-Puyol, S.; Heredia, A.; Heredia-Guerrero, J.A. Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin. Polymers 2020, 12, 942.

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