Microencapsulation of a functional dye and its UV crosslinking controlled releasing behavior

Li, Gangqiang; Guo, Jinbao; Wang, Xiao; Wei, Jie

doi:10.1002/pola.23434

Cited by 14 publications

(11 citation statements)

References 32 publications

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“…Loss in weight of the sample verifies that the reaction has taken place between TDI and ethylenediamine and polyurea capsules are formed. (56,57). As shown in Figure 9, initial weight loss can be factored due to water loss, second weight loss of 31.94% in the range of 216-255°C is due to evaporation and degradation of the active material oxyfluorfen.…”

Section: Thermo Gravimetric Analysismentioning

confidence: 99%

Release behavior of oxyfluorfen polyurea capsules prepared using PVA and kraft lignin as emulsifying agents and phytotoxicity study on paddy

Rao

Chandrani

Powar

et al. 2021

Green Chemistry Letters and Reviews

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Polyurea microcapsules containing oxyfluorfen herbicide were synthesized by interfacial polymerization reaction between toluene diisocyanate and ethylene diamine at various core to shell ratios using green solvent N-N-dimethyldecanamide as carrier medium and using biodegradable PVA203S and Kraft lignin grade (varying molecular weight) as the emulsifying agent. The study was done to understand the effect of stirring rate on preparing microcapsules and find out how the process conditions changed the attributes of microcapsules such as particle size distribution, encapsulation efficiency and release kinetics. The formation of capsules was confirmed by FT-IR, SEM and TGA. The study indicated that the encapsulation efficiency decreased with increasing core to shell ratio. The change in release kinetics was based on the stirring rate and was dependent on the pH of release medium. Particle size distribution was influenced by the agitation speed during formation of emulsion. Kraft lignins of varying molecular weight were used to synthesize the polyurea capsules. It was found that capsules with high molecular weight lignin showed slow and sustained release. Synthesized polyurea capsules was subjected to safety study on paddy crop and compared with commercially available oxyfluorfen and was found to be safe for use on paddy crop.

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Section: Thermo Gravimetric Analysismentioning

confidence: 99%

Release behavior of oxyfluorfen polyurea capsules prepared using PVA and kraft lignin as emulsifying agents and phytotoxicity study on paddy

Rao

Chandrani

Powar

et al. 2021

Green Chemistry Letters and Reviews

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“…Figure S6 displays the TGA diagrams of core material and polyurea microcapsules synthesized from various amines. Weight loss of each sample also verifies the formation of polyurea microcapsules with high thermal stability [ 26 , 27 ]. The initial weight loss of 36%-49% in the range of 110°C–232°C is attributed to the volatilization and degradation of the core material oxyfluorfen.…”

Section: Study Of Surface Morphologymentioning

confidence: 99%

Design and application of polyurea microcapsules containing herbicide (oxyfluorfen)

Rao

Chandrani

Powar

et al. 2020

Designed Monomers and Polymers

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Polyurea, a controlled release material, has been widely applied in agricultural fields due to high thermal stability and low cost. In this article oxyfluorfen polyurea microcapsules suspension was successfully prepared by interfacial polymerization using diisocyanate and polyamines such as Ethylenediamine, Hexamethylenediamine, Diethylenetriamine in presence of green solvent, i.e., N, N-dimethyldecanamide. The microcapsule suspension of oxyfluorfen has not been researched yet by using solvent N,N-dimethyldecanamide and polyamines. The effect and the type of diamines on the morphology and properties of the microcapsules have been investigated. The synthesized microcapsules were characterized by scanning electron microscope, ultraviolet spectrometry, Fourier transform iInfrared spectrometer, thermogravimetric analysis and particle size analyser. The effect of the core to shell ratio on encapsulation efficiency and release kinetics were also studied. The oxyfluorfen microcapsules had an excellent encapsulation efficiency (98.2%) using EDA as the monomer and Release kinetics depended upon the type of monomers used and also on core to shell ratio used (6.5:1, 5:1, 4:1). As core to shell ratio was increased the encapsulation efficiency was found to decrease. Prepared Microcapsules when sprayed on paddy crop was found to be safe in comparison with Emulsifiable concentrate sample.

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“…When self-healing composites are thermally cured, the embedded microcapsules have to experience heat treatment. The thermal stability plays an important role in their application [27][28][29]. Figure 9 presents TGA diagrams of polyurea microcapsules from different water soluble monomers.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Effect on the characterization of metolachlor polyurea microcapsules with urea instead of polyamines

Liu

Wang

et al. 2019

Designed Monomers and Polymers

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In this paper, a novel metolachlor microcapsules suspension (CS) was prepared by interfacial polymerization. Metolachlor polyurea microcapsules suspension was successfully prepared by urea instead of polyamines which could reduce the use of organic solvents and production costs. The synthesized microcapsules were characterized by Fourier Transform Infrared Spectrometer, Scanning Electron Microscope, Ultraviolet Spectrometry, Thermogravimetric analyses and particle size analyzer. In conclusion, the diameter of the urea microcapsules were the smallest (11.52 μm) and excellent encapsulation efficiency (81.45%). In addition, Urea microcapsules had compact microstructures and global shapes, which had a good thermal stability and metolachlor could be preserved better in the polyurea microcapsules. These results indicated that the prepared microcapsules by urea had better thermal storage properties and physicochemical property. The microcapsule suspension of metolachlor hasn’t been researched yet. Therefore, it is significant to prepare microcapsule suspension. More importantly, there is no use of organic solvents in the preparation of microcapsules suspension, which avoided the pollution of solvents to the ecological environment. It is hoped that this polyurea material will be applied in the field of pesticide synthesis and polymers.

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Microencapsulation of a functional dye and its UV crosslinking controlled releasing behavior

Cited by 14 publications

References 32 publications

Release behavior of oxyfluorfen polyurea capsules prepared using PVA and kraft lignin as emulsifying agents and phytotoxicity study on paddy

Release behavior of oxyfluorfen polyurea capsules prepared using PVA and kraft lignin as emulsifying agents and phytotoxicity study on paddy

Design and application of polyurea microcapsules containing herbicide (oxyfluorfen)

Effect on the characterization of metolachlor polyurea microcapsules with urea instead of polyamines

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