ABSTRACT Polyurea, a controlled release material, has been widely applied in agricultural fields due to high thermal stability and low cost. In this article oxyfluorfen polyurea microcapsules suspension was successfully prepared by interfacial polymerization using diisocyanate and polyamines such as Ethylenediamine, Hexamethylenediamine, Diethylenetriamine in presence of green solvent, i.e., N,N-dimethyldecanamide. The microcapsule suspension of oxyfluorfen has not been researched yet by using solvent N,N-dimethyldecanamide and polyamines. The effect and the type of diamines on the morphology and properties of the microcapsules have been investigated. The synthesized microcapsules were characterized by scanning electron microscope, ultraviolet spectrometry, Fourier transform iInfrared spectrometer, thermogravimetric analysis and particle size analyser. The effect of the core to shell ratio on encapsulation efficiency and release kinetics were also studied. The oxyfluorfen microcapsules had an excellent encapsulation efficiency (98.2%) using EDA as the monomer and Release kinetics depended upon the type of monomers used and also on core to shell ratio used (6.5:1, 5:1, 4:1). As core to shell ratio was increased the encapsulation efficiency was found to decrease. Prepared Microcapsules when sprayed on paddy crop was found to be safe in comparison with Emulsifiable concentrate sample.

中文翻译：

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除草剂（乙氧氟草醚）聚脲微胶囊的设计与应用


摘要 聚脲作为一种控释材料，由于热稳定性高、成本低，在农业领域得到了广泛的应用。本文采用二异氰酸酯与乙二胺、己二胺、二亚乙基三胺等多胺在绿色溶剂N,N-二甲基癸酰胺存在下，通过界面聚合成功制备了乙氧氟草醚聚脲微胶囊悬浮液。使用溶剂N,N-二甲基癸酰胺和多胺制备乙氧氟草醚微胶囊悬浮液尚未进行研究。研究了二胺的类型和对微胶囊形态和性能的影响。通过扫描电镜、紫外光谱、傅里叶变换红外光谱仪、热重分析和粒度分析仪对合成的微胶囊进行了表征。还研究了核壳比对包封效率和释放动力学的影响。使用 EDA 作为单体，乙氧氟草醚微胶囊具有优异的包封率 (98.2%)，释放动力学取决于所用单体的类型以及所用的核壳比 (6.5:1、5:1、4:1)。随着核壳比的增加，发现封装效率降低。发现与乳油样品相比，制备的微胶囊喷洒在水稻作物上是安全的。