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Erschienen in: Journal of Coatings Technology and Research 2/2019

20.08.2018

The influence of the structural features of lignin-based polyurethane coatings on ammonium sulfate release: kinetics and thermodynamics of the process

verfasst von: Francisco Avelino, Isabela Pires Miranda, Tainá Dantas Moreira, Helena Becker, Francisco Belmino Romero, Carlos Alberto Kenji Taniguchi, Selma Elaine Mazzetto, Men de Sá Moreira de Souza Filho

Erschienen in: Journal of Coatings Technology and Research | Ausgabe 2/2019

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Abstract

The influence of the properties of lignin-based polyurethane (PU) coatings on the release behavior of ammonium sulfate was assessed through complete physicochemical, structural, and morphological characterization. The influence of the release medium was evaluated as well. The higher the amount of lignin in the coatings was, the lower the pore diameter and swelling degree and the higher crosslinking were. The hydrophobicity of coatings was not significantly changed by increasing the lignin content. However, the opposite behavior was observed for their biodegradability. The results of the nutrient release experiments showed that the two formulations of lignin-based PUs had very similar behavior in terms of release rates of NH4+ and SO42− in both release media, despite their different properties. However, there was a difference between their release rate constants obtained by using three different kinetic models. In addition, both PU coatings released a higher amount of SO42− than NH4+ in both media. The thermodynamic data suggest that dissolution and release processes for SO42− are more spontaneous than that for NH4+. Nevertheless, both coatings behaved in accordance with CEN standards for CRF systems, representing a potential technique for agricultural applications.

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Metadaten
Titel
The influence of the structural features of lignin-based polyurethane coatings on ammonium sulfate release: kinetics and thermodynamics of the process
verfasst von
Francisco Avelino
Isabela Pires Miranda
Tainá Dantas Moreira
Helena Becker
Francisco Belmino Romero
Carlos Alberto Kenji Taniguchi
Selma Elaine Mazzetto
Men de Sá Moreira de Souza Filho
Publikationsdatum
20.08.2018
Verlag
Springer US
Erschienen in
Journal of Coatings Technology and Research / Ausgabe 2/2019
Print ISSN: 1547-0091
Elektronische ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-018-0123-y

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