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    • The nitrogen slow-release fertilizer based on urea incorporating chitosan and poly(vinyl alcohol) blend
    Authors: Phong Thanh Vo; Huu The Nguyen; Hai Thi Trinh; Viet Minh Nguyen; Anh-Tuan Le; Huy QuangTran; Thuy Thi Thu Nguyen;  Advisor: -;  Co-Author: - (2021)

    For mitigating environmental pollution caused by excess usage of urea fertilizer, this paper reports a new fertilizer formulation, based on urea incorporating chitosan (CS) and poly (vinyl alcohol) (PVA) blend, for the slow release of urea. The urea/CS/PVA formulations were prepared by cross-linking CS and PVA blend in the presence of urea with glutaraldehyde as a cross-linker. The results indicated an interaction between urea and the functional groups of CS and PVA through hydrogen bonding, which has significant effects on the thermal properties of urea/CS/PVA formulation. The surface morphology of urea/CS/PVA formulations showed that the quantity of urea crystals anchored on the surface increased with the contents of urea and the cross-linking agent. Urea/CS/PVA formulations with ...