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Vol. 30 No. 11 (2018): Vol 30 Issue 11

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Controlled Release of Insecticides through Polyurea Microcapsules Synthesized by Interfacial Polycondensation

https://doi.org/10.14233/ajchem.2018.21631
Ujvala P. Christian
Department of Chemical Engineering, Vishwakarma Government Engineering College (Affiliated to Gujarat Technological University, Ahmedabad), Ahmedabad-382 424, India
Shrikant J. Wagh
Gujarat Power Engineering and Research Institute (Affiliated to Gujarat Technological University, Ahmedabad), Mehsana-384460, India

Corresponding Author(s) : Shrikant J. Wagh

sjwagh@gmail.com

Asian Journal of Chemistry, Vol. 30 No. 11 (2018): Vol 30 Issue 11

Abstract

Among the various objectives of microencapsulation, controlled release of an active ingredient is perhaps the most engaging and challenging. Interfacial polycondensation is one of the most effective techniques for the synthesis of microcapsules loaded with an active ingredient. Here, chlorpyriphos, cypermethrin and pretilachlor have been encapsulated in polyurea shells synthesized via interfacial polycondensation under various preparative conditions and their release rates into methanol at 28-30 ºC. The effect of initial monomer mole ratio, temperature, and the number of moles of limiting reactant (during synthesis of microcapsules by interfacial polycondensation) is discussed in terms of the properties of the shell, which ultimately controls the release rate. Semi-crystalline polyurea was synthesized which was characterized by Fourier transform infrared spectrophotometer, powder X-ray analysis and differential scanning calorimeter. The encapsulation efficiency of various insecticides increases with a decrease in initial monomer mole ratio and decrease in moles of limiting reactant.

Keywords

Polyurea Interfacial polycondensation Controlled release
Christian, U. P., & Wagh, S. J. (2018). Controlled Release of Insecticides through Polyurea Microcapsules Synthesized by Interfacial Polycondensation. Asian Journal of Chemistry, 30(11), 2571–2576. https://doi.org/10.14233/ajchem.2018.21631
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