Shen Yue, Wang Yan, Zhao Xiang, Sun Changjiao, Cui Bo, Gao Fei, Zeng Zhanghua, Cui Haixin
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Polymers (Basel). 2017 Sep 5;9(9):418. doi: 10.3390/polym9090418.
Thermo-responsive release emamectin benzoate microcapsules were successfully prepared with a polydopamine (PDA)--poly(-isopropylacrylamide) (PNIPAm) multifunctional layer. Preparation of emamectin benzoate microcapsules was first studied by emulsion interfacial-polymerization using PDA as a wall material. Then the amino-terminated PNIPAm was grafted on the PDA layer by its amino group in aqueous solution. Physicochemical characterization of microcapsules was obtained by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and dynamic light scattering (DLS). Kinetic study of emamectin benzoate release showed that the microcapsules exhibit sustained- and controlled-release properties. The multifunctional layer can release emamectin benzoate easily when the temperature was below the lower critical solution temperature (LCST). In contrast, when the temperature increased above the LCST, the release rate was reduced. The results indicated that these microcapsules with excellent thermo-sensitivity would be promising in the research field of pesticide microcapsules.
采用聚多巴胺（PDA）-聚（N-异丙基丙烯酰胺）（PNIPAm）多功能层成功制备了热响应性释放的苯甲酰胺基阿维菌素微胶囊。首先以PDA为壁材，通过乳液界面聚合法研究了苯甲酰胺基阿维菌素微胶囊的制备。然后，氨基封端的PNIPAm在水溶液中通过其氨基接枝到PDA层上。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和动态光散射（DLS）对微胶囊进行了物理化学表征。苯甲酰胺基阿维菌素释放的动力学研究表明，微胶囊具有缓释和控释性能。当温度低于最低临界溶液温度（LCST）时，多功能层可轻松释放苯甲酰胺基阿维菌素。相反，当温度升高到LCST以上时，释放速率降低。结果表明，这些具有优异热敏感性的微胶囊在农药微胶囊研究领域具有广阔的应用前景。
