Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Abstract

New sequence of microcapsules with dendritic PAMAM-based novel polyurea as shell wall material containing herbicide as a core moiety has been prepared by interfacial polymerization technique. Dendrimer-based polymeric microcapsules were fabricated with aim to study the effect of different reaction parameters such as surfactant dose, core loading, agitation speed, and amount of solvent on particle size, particle size distribution, and appearance of microcapsules. Prepared microcapsules were characterized by FTIR, thermo gravimetric analysis, particle size analysis, scanning electron microscope, and other microscopic technique. In present investigation, surfactant dose of 2.5% with 5 mL of solvent at 400 rpm was found to be optimum for fabrication of stable new polyurea microcapsules containing 1 g of core. The synthesized microcapsules with optimized parameters were evaluated quantitatively for controlled release study by gas chromatography in different environmental conditions. The highest percent release of core was found in acidic conditions compared to that of basic and least in neutral medium.

Microencapsulation of quinoline as a corrosion inhibitor in polyurea microcapsules for application in anticorrosive PU coatings

“…PAMAM based microcapsule has free NH 2 group on the wall surface. As given in the previous article [23], in HCl solution amine functionality from the wall surface of microcapsule forms the salt which may affects compact structure of the shell and causes the release of inhibitor. In aqueous acidic solutions, the quinoline molecules exist either as neutral molecules or as protonated quinoline ([QNHn] n+ ).…”

“…In the case of microcapsules, the use of dendritic branching molecules can improve the solvent resistance and water resistance as well as the heat response of microcapsules [21]. In our previous papers, we noted that polyurea microcapsules synthesized with 0.0 G PAMAM dendrimer exhibits improved interfacial interaction with the polymer matrix along with enhanced thermal stability [22,23]. Thus, in this study an attempt has been undertaken to employ 0.0 G PAMAM with terminal amine groups as a functional monomer to synthesize polyurea microcapsules containing quinoline as an organic corrosion inhibitor.…”

Pretilachlor Releasable Polyurea Microcapsules Suspension Optimization and Its Paddy Field Weeding Investigation

“…The overuse of pretilachlor may cause harm to the environment by damaging non-target plants, water, sediment, and food (Ismail and Handah, 1999;Vencill et al, 2012;Palma et al, 2014;Papadakis et al, 2015). For these reasons, numerous efforts have been devoted to minimizing the adverse effects and environmental toxicity of herbicides, such as using them along with safeners, packing them with carrier materials, or loading them into microcapsules (Hedaoo et al, 2013;de Oliveira et al, 2015;Cao et al, 2016;Liu et al, 2016;Wu et al, 2020). Microcapsules with controlled release abilities can prevent herbicides from leaking via evaporation or degradation during application so as to ultimately improve the herbicidal efficiency and minimize non-target toxicity (Hedaoo et al, 2013(Hedaoo et al, , 2014Zhang et al, 2016Zhang et al, , 2018, which has become a popular and feasible trend in recent years.…”

Advances in Targeted Pesticides with Environmentally Responsive Controlled Release by Nanotechnology

“…Hedaoo et al prepared pendimethalin microcapsules by interfacial polymerization using polyurethane-amine dendrimer for the wall material. The results indicated that the microcapsules had the lowest cumulative release rate under neutral conditions, whereas the cumulative release rate under acidic conditions was higher than under alkaline conditions [ 10 ]. Guo et al prepared new, functionalized emamectin benzoate microcapsules cross-linked by silica and carboxymethylcellulose.…”