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Title

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

AuthorsBenítez, José J. ; Osbild, Sonja; Guzmán-Puyol, Susana; Heredia, Antonio; Heredio-Guerrero, José A.
KeywordsBio-based polymer
Fatty polyhydroxyesters
Can coatings
Esterification kinetics
Melt-polycondensation
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationPolymers, 12: 942 (2020)
AbstractMetals 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- m-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 e ect of the tin oxide layer in such an oxidative cleavage process fosters the potential of this methodology for the design of e ective long-chain polyhydroxyester coatings on ETP.
Publisher version (URL)http://dx.doi.org/10.3390/polym12040942
URIhttp://hdl.handle.net/10261/212091
DOI10.3390/polym12040942
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