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Poly(ε-caprolactone)-g-Guar Gum and Poly(ε-caprolactone)-g-Halloysite Nanotubes as Coatings for Slow-Release DAP Fertilizer

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Abstract

Biodegradable coating materials based on PCL grafted on guar gum and halloysite nanotubes have been synthetized and used to delay the nutrients release from Diammonium Phosphate (DAP) as water-soluble fertilizer granules. The combination of hydrophobic character of PCL as biodegradable polymer and the swelling behavior of guar gum (GG) and halloysite nanotubes (HNT) as natural fillers were evaluated in this study with a view of the slow release of fertilizers. Indeed, the hydroxyl groups on the guar gum (GG) and halloysite (HNTs) surfaces act as initiators for caprolactone in situ ring opening polymerization and the developing polymers are covalently grafted to the GG and HNTs. Moreover, the hydrophilic character of fillers (GG & HNT) improves the adhesion between the coating agent and the surface of the (DAP) granules and consequently DAP granules were successfully coated by the dip-coating process with fixed thickness of ~ 25 µm as revealed by the scanning electron microscopy. The evaluation of the release behavior of DAP coated by the composites (PCL-g-GG and PCL-g-HNT) demonstrates that the liberation rate could be controlled by adjusting the fillers (GG or HNT) contents in the coating materials (PCL-g-GG and PCL-g-HNT). This encapsulation expands the nitrogen and phosphorus release to more than 50 h instead of only 2 h for uncoated DAP granules.

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Acknowledgements

The Authors would like to acknowledge the support through the R&D Initiative—Appel à projets autour des phosphates APPHOS—sponsored by OCP (OCP Foundation, R&D OCP, Mohammed VI Polytechnic University, National Centre of Scientific and technical Research CNRST, Ministry of Higher Education, Scientific Research and Professional Training of Morocco MESRSFC) under the project entitled “Stabilisation et liberation contrôlée des fertilisants par enrobage des engraisphosphatés par de nouvelles formulations polymères: uneoption de l’utilisationefficace des nutriments dans l’agriculture”, Project IDVAL-RAI-01/2017 and the CNRST-Morocco, Projet Prioritaire PPR1/2015/73 and Alexander von Humboldt Foundation for supporting synthesis of bio-nanocomposites.

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Authors and Affiliations

  1. IMED-Lab, Faculty of Sciences and Techniques, Cadi Ayyad University, Avenue Abdelkrim, Elkhattabi, B.P. 549, 40000, Marrakech, Morocco

    Taha El Assimi, Manal Chaib, Mustapha Raihane & Mohammed Lahcini

  2. Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, 43150, Ben Guerir, Morocco

    Manal Chaib, Rachid Benhida, Redouane Beniazza & Mohammed Lahcini

  3. Laboratory of Biotechnology and Molecular Bioengineering, Departement of Biology. Faculté des Sciences et Techniques, Université Cadi-Ayyad, 40000, Marrakech, Morocco

    Abdellatif El Meziane

  4. UM6P- OCP- Jorf Lasfar, B.P. 118, 24000, El Jadida, Morocco

    Mehdi Khouloud

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  1. Taha El Assimi
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Correspondence to Mohammed Lahcini.

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El Assimi, T., Chaib, M., Raihane, M. et al. Poly(ε-caprolactone)-g-Guar Gum and Poly(ε-caprolactone)-g-Halloysite Nanotubes as Coatings for Slow-Release DAP Fertilizer. J Polym Environ 28, 2078–2090 (2020). https://doi.org/10.1007/s10924-020-01750-7

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