Preparation and Characterization of Modified Polylactic Acid-co- Polyethylene Glycol-co- Polylactic Acid Microcapsules Enclosing Cypermethrin

摘要

Tri-block poly(lactide)-poly(ethylene glycol)-poly(lactide), diacrylated derivative and the cypermethrin-loaded microcapsule were prepared, respectively. The structure of the copolymer was characterized by ~!HNMR, FTIR, TGA and DSC. The microcapsules were characterized by OM(optical microscope), SEM, FTIR, TGA and DSC. The encapsulation efficiency of the microcapsules is 91.3%. The microcapsules showed good dispersity and sustained release behavior in 50% ethylene glycol aqueous solution.