氟氯氰菊酯
聚乙二醇
动力学
乙二醇
PEG比率
化学
水溶液
共聚物
扩散
控制释放
化学工程
色谱法
核化学
聚合物
有机化学
杀虫剂
溴氰菊酯
工程类
经济
农学
物理
热力学
生物
量子力学
财务
作者
Kumelachew Mulu Loha,Najam A. Shakil,Jitendra Kumar,Manish Kumar Singh,Totan Adak,Suresh Jain
标识
DOI:10.1080/03601234.2011.540200
摘要
Controlled release formulations of β-cyfluthrin, a non-systemic, broad spectrum contact insecticide, have been prepared using laboratory synthesized poly(ethylene glycol) (PEG) based amphiphilic copolymers. Copolymers of polyethylene glycols of different molecular weights and various dimethyl esters, viz. dimethyl isophthalate, which self assemble into nano micellar aggregates in aqueous media, have been synthesized. The kinetics of β-cyfluthrin from developed controlled release (CR) formulations were studied in comparison with that of the commercially available 025 SC. Release from the commercial formulation was faster than with the developed CR formulations. The rate of release of encapsulated β-cyfluthrin from nano micellar aggregates is reduced by increasing the molecular weight of PEG. The diffusion exponent (n value) of β-cyfluthrin in water ranged from 0.427 to 0.622 in the tested formulations. The release was diffusion controlled with a half-release time (t(½)) of 3.92 to 7.9 days in water from different formulations, and the period of optimum availability (POA) of β-cyfluthrin ranged from 1.4 to 20.5 days. The results suggest that the application rate of β-cyfluthrin can be optimized to achieve insect control at the desired level and period.
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