文献类型：期刊文献

英文题名：Preparation and characterisation of polylactic acid modified polyurethane microcapsules for controlled-release of chlorpyrifos

作者：Zheng, Ting[1];Chen, Kui[1];Chen, Wanyu[1];Wu, Bin[1];Sheng, Yong[1];Xiao, Yao[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai, Peoples R China

年份：2019

卷号：36

期号：1

起止页码：62

外文期刊名：JOURNAL OF MICROENCAPSULATION

收录：;EI(收录号：20242616361301);WOS:【SCI-EXPANDED(收录号:WOS:000466134900001)】；

基金：We thank the Shanghai Municipal Committee of Science and Technology for financial support through projects 18595800900.

语种：英文

外文关键词：Polyurethane; PLA; interfacial polymerisation

摘要：Polyurethane modified with polylactic acid microcapsules were fabricated for controlled release of chlorpyrifos (one of the high usage solid phosphorous insecticides) via interfacial polymerisation with diphenylmethane diisocyanate, polyether triol, 1,4-butanediol and polylactic acid as modifier. The structure, morphology and release properties of synthesised microcapsules were characterised by Fourier transform infra-red spectroscopy, thermogravimetric analyser, scanning electron microscope, particle size analyser and high-performance liquid chromatography. More benign solvents, namely ethyl acetate and n-butyl acetate were used as replacement for toxic solvents commonly used in the preparation of polyurethane microcapsules, namely xylene. The spherical microcapsules prepared in this study were 1-20 mu m in diameter. Fourier transform infra-red spectroscopy indicated that polylactic acid had successfully participated in the interfacial polymerisation of polyurethane. Encapsulation efficiency of microcapsules can amount up to 71.0% w/w with a loading efficiency of 26.2% w/w. The microcapsules exhibited a sustained release period above 60 days. Combining polylactic acid into the soft segment of polyurethane proves to effectively accelerate the release rate.