Abstract:
: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 μm 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.
journal_name
J Microencapsuljournal_title
Journal of microencapsulationauthors
Zheng T,Chen K,Chen W,Wu B,Sheng Y,Xiao Ydoi
10.1080/02652048.2019.1599075subject
Has Abstractpub_date
2019-01-01 00:00:00pages
62-71issue
1eissn
0265-2048issn
1464-5246journal_volume
36pub_type
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