当前位置: X-MOL 学术Polym. Adv. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Preparation and characterization of pesticide Fosthiazate-loaded microcapsules for controlled release system
Polymers for Advanced Technologies ( IF 3.4 ) Pub Date : 2022-12-08 , DOI: 10.1002/pat.5957
Takahiro Maruyama, Yutaka Ishibashi, Mitsuo Sano, Yoshinari Taguchi

Preparation of Fosthiazate (FTZ)-loaded microcapsules with controlled release was attempted by the interfacial polymerization using toluene diisocyanate (TDI) and triethylenetetramine (TETA) as monomers. The effects of the monomer concentration and the monomer concentration ratio on characteristics of the microcapsules such as size, shell thickness and release behavior in water and in soil were studied. In the study, FTZ was successfully encapsulated into a polyurea resin, and the characterization revealed that the microcapsule shell became thicker proportionally to the applied monomer concentration. The release rate of FTZ from the microcapsules in water was mostly proportional to the ratio of the surface area to the shell thickness of the microcapsules, and the release rate fitted the first-order kinetic model. On the one hand, when TDI concentration was low or the monomer concentration ratio was high, the release rate was significantly increased owing to the formation of insufficient microcapsule shell and the coarseness of the shell. Moreover, the slower the release rate in water was, the higher residual ratio of FTZ in soil could be maintained. However, it was also observed that the release rate in soil was faster than that in water. It is suggested that the constant replacement of water around the microcapsules accelerated the release rate, or the microcapsule particles migrated through the soil. These results indicated that FTZ-loaded microcapsules with controlled release were able to be prepared. In addition, basic findings about the relationship and the difference between the release behaviors of FTZ-loaded microcapsules in water and in soil were obtained.

中文翻译:

农药噻唑磷控释微胶囊的制备及表征

以甲苯二异氰酸酯 (TDI) 和三亚乙基四胺 (TETA) 为单体,通过界面聚合制备了噻唑磷 (FTZ) 控释微胶囊。研究了单体浓度和单体浓度比对微胶囊的尺寸、壳厚度以及在水中和土壤中的释放行为等特性的影响。在这项研究中,FTZ 被成功地封装到聚脲树脂中,表征表明微胶囊壳的厚度与应用的单体浓度成正比。FTZ从微胶囊在水中的释放速率主要与微胶囊表面积与壳厚度之比成正比,释放速率符合一级动力学模型。一方面,当TDI浓度低或单体浓度比高时,由于微胶囊壳的形成不充分和壳的粗糙,释放速率显着增加。此外,在水中的释放速度越慢,FTZ在土壤中的残留率越高。然而,也观察到在土壤中的释放速率比在水中的释放速率快。提示微胶囊周围水的不断置换加速了释放速率,或者微胶囊颗粒在土壤中迁移。这些结果表明能够制备控释的载有 FTZ 的微胶囊。此外,获得了关于载有 FTZ 的微胶囊在水中和土壤中的释放行为之间的关系和差异的基本发现。
更新日期:2022-12-08
down
wechat
bug