In this study, the preparation and characterization of haloxyfop-R-methyl herbicide loaded in poly(methylmethacrylate) (PMMA) nano-capsules by emulsion polymerization and its release behavior were investigated. The chemical characterizations of PMMA/haloxyfop-R-methyl nano-capsules were confirmed by FT-IR spectroscopy method, and the surface morphology was studied by field emission scanning electron microscopy and transmission electron microscopy. Also, the herbicide loading and encapsulation efficiency were analyzed for the herbicide-loaded nano-capsules. The release rate of PMMA/haloxyfop-R-methyl nano-capsules was determined by UV-visible spectroscopy. The thermal properties and thermal stability of nano-capsules were explored by the thermal gravimetric analysis method. The diameter of the nano-capsules was in the range of 100-300 nm. Increasing the amount of herbicide in nano-formulations significantly affected the surface of the nano-capsules and reduced their surface smoothness. Triton-X100 was identified as the best surfactant for the preparation of nano-capsules, and the sample containing the lowest herbicide content showed the best performance in terms of encapsulation and loading efficiency. This sample showed a steady-state release rate during the six days.

中文翻译：

---

含卤代甲氧基-R-甲基的聚（甲基丙烯酸甲酯）纳米胶囊的制备与释放性能研究。

本研究研究了乳液聚合法制备聚甲基丙烯酸甲酯（PMMA）纳米胶囊中卤代氧杂-R-甲基除草剂的制备，表征及其释放行为。FT-IR光谱法证实了PMMA /卤代甲氧基-R-甲基纳米胶囊的化学特性，并通过场发射扫描电子显微镜和透射电子显微镜研究了其表面形态。此外，分析了除草剂负载的纳米胶囊的除草剂负载和包封效率。通过紫外线可见光谱法测定了PMMA /卤代甲氧基-R-甲基纳米胶囊的释放速率。用热重分析法研究了纳米胶囊的热性能和热稳定性。纳米胶囊的直径在100-300nm的范围内。纳米制剂中除草剂数量的增加显着影响了纳米胶囊的表面并降低了其表面的光滑度。Triton-X100被认为是制备纳米胶囊的最佳表面活性剂，而除草剂含量最低的样品在封装和装载效率方面表现出最佳性能。该样品在六天内显示出稳态释放速率。