Journal of Coatings Technology and Research

, Volume 16, Issue 2, pp 449–463 | Cite as

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

  • Francisco AvelinoEmail author
  • 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


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.


Coconut shell Biodegradable materials Fertilizer Solvent-free polymerization Unmodified lignin 



Attenuated total reflectance




Coconut shell


Coconut shell powder


Coconut shell ethanosolv lignin


Committee of European normalization


Controlled-release fertilizers


Crosslinking degree


Fourier transform infrared spectroscopy


Gel permeation chromatography


International Fertilizer Industry Association


Isocyanate groups


Nitrogen use efficiency




Nutrient release rate



PEG 400

Polyethylene glycol 400


Polyurethane-coated ammonium sulfate


Population reference bureau


Scanning electron microscopy


Swelling degree


Toluene 2,4-diisocyanate


Water contact angle



We gratefully acknowledge the Laboratório de Produtos e Tecnologia em Processos (LPT) for FTIR analyses, M.Sc. Laís Helena and Prof. Dr. Odair Pastor for BET analyses, M.Sc. Lyndervan Alcântara for WCA analyses, M.Sc. Nádia Oliveira for CHN analyses, Central Analítica-UFC/CT-INFRA/MCTI-SISNANO/Pró-Equipamentos, CNPq and CAPES for the financial support.

Supplementary material

11998_2018_123_MOESM1_ESM.docx (565 kb)
Supplementary material 1 (DOCX 560 kb)


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Copyright information

© American Coatings Association 2018

Authors and Affiliations

  • Francisco Avelino
    • 1
    • 3
    Email author
  • Isabela Pires Miranda
    • 1
  • Tainá Dantas Moreira
    • 2
  • Helena Becker
    • 2
  • Francisco Belmino Romero
    • 2
  • Carlos Alberto Kenji Taniguchi
    • 3
  • Selma Elaine Mazzetto
    • 1
  • Men de Sá Moreira de Souza Filho
    • 3
  1. 1.Departament of Organic and Inorganic ChemistryFederal University of CearaFortalezaBrazil
  2. 2.Departament of Analytical and Physical ChemistryFederal University of CearaFortalezaBrazil
  3. 3.Embrapa Agroindustria TropicalFortalezaBrazil

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