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Self-healing modification of bio-based polyurethane coated fertilizers with aromatic disulfide compounds to enhance the controlled release of nitrogen

文献类型： 外文期刊

作者： Wang, Chao 1 ; Li, Hong 1 ; Shen, Yu 1 ; Du, Liqing 1 ; Yang, Ziming 1 ; He, Zuyu 1 ; Liu, Yunhao 1 ; Zhou, Chuang 1 ; Li, Puwang 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, South Subtrop Crop Res Inst, Zhanjiang 524091, Guangdong, Peoples R China

2.Hainan Key Lab Trop Crop Nutr, Zhanjiang 524091, Guangdong, Peoples R China

3.Yunnan Agr Univ, Coll Trop Crops, Kunming 650500, Yunnan, Peoples R China

关键词： Self-healing; Bio-based polyurethane; Coated fertilizers; Controlled release; Aromatic disulfide

期刊名称：POLYMER （ 影响因子：4.5； 五年影响因子：4.3 ）

ISSN： 0032-3861

年卷期： 2025 年 335 卷

页码：

收录情况： SCI

摘要： To solve the problem that the membrane shell is easily damaged during the preparation of biobased coated fertilizer, the self-healing modification of biobased membrane was carried out by aromatic disulfide covalent compounds. Bio-based polyurethanes modified by aromatic disulfide with different molecular configuration were synthesized. The effects of three kinds of aromatic disulfide on the structure and properties of bio-based polyurethanes and coated fertilizers were compared and analyzed by various analytical techniques. The results demonstrated that the addition of aromatic disulfide significantly improves the mechanical strength and thermal stability of the bio-based coating, while reducing the porosity of the coating. The tensile strength was increased by about 700 %, and the cross-linked network formed by disulfide bond effectively regulated the release rate of nutrients. Compared with the unmodified polyurethane coating, the release rate was slower and the release time was longer. Under the same coating rate, the modified coating could more effectively improve the initial release rate and release cycle of nutrients, especially when the coating rate was 7 %. The release period can be extended up to 148 days. In summary, the cross-linking of bio-based PU and aromatic disulfide covalent compounds can effectively control the release rate of fertilizer nutrients, thereby, improving the performance of coated fertilizer and minimizing the impact on the environment.

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