Shell thickness and chemical structure of polyurea microcapsules prepared with haxamethylene diisocyanate uretidione and isocyanurate

Takahashi, Tadatsugu; Taguchi, Yoshinari

doi:10.1002/app.25061

Cited by 8 publications

(3 citation statements)

References 10 publications

(21 reference statements)

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“…2.8 g of PVA was dissolved in 137.2 g of water to prepare a continuous phase (W phase) 21 . 30 g of FTZ was dissolved in 30 g of MO to prepare a core material.…”

Section: Methodsmentioning

confidence: 99%

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Preparation and characterization of pesticide Fosthiazate‐loaded microcapsules for controlled release system

Maruyama

Ishibashi

Sano

et al. 2022

Polymers for Advanced Techs

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Preparation of Fosthiazate (FTZ)-loaded microcapsules with controlled release was attempted by the interfacial polymerization using toluene diisocyanate (TDI) and triethylenetetramine (TETA) as monomers. The effects of the monomer concentration and the monomer concentration ratio on characteristics of the microcapsules such as size, shell thickness and release behavior in water and in soil were studied. In the study, FTZ was successfully encapsulated into a polyurea resin, and the characterization revealed that the microcapsule shell became thicker proportionally to the applied monomer concentration. The release rate of FTZ from the microcapsules in water was mostly proportional to the ratio of the surface area to the shell thickness of the microcapsules, and the release rate fitted the first-order kinetic model. On the one hand, when TDI concentration was low or the monomer concentration ratio was high, the release rate was significantly increased owing to the formation of insufficient microcapsule shell and the coarseness of the shell. Moreover, the slower the release rate in water was, the higher residual ratio of FTZ in soil could be maintained. However, it was also observed that the release rate in soil was faster than that in water. It is suggested that the constant replacement of water around the microcapsules accelerated the release rate, or the microcapsule particles migrated through the soil. These results indicated that FTZ-loaded microcapsules with controlled release were able to be prepared. In addition, basic findings about the relationship and the difference between the release behaviors of FTZ-loaded microcapsules in water and in soil were obtained.

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“…2.8 g of PVA was dissolved in 137.2 g of water to prepare a continuous phase (W phase) 21 . 30 g of FTZ was dissolved in 30 g of MO to prepare a core material.…”

Section: Methodsmentioning

confidence: 99%

“…2.8 g of PVA was dissolved in 137.2 g of water to prepare a continuous phase (W phase). 21 30 g of FTZ was dissolved in 30 g of MO to prepare a core material. TDI was dissolved in the core material solution to a given concentration (C TDI ) to prepare a dispersed phase (O phase).…”

Section: Preparation Of Microcapsulesmentioning

confidence: 99%

Preparation and characterization of pesticide Fosthiazate‐loaded microcapsules for controlled release system

Maruyama

Ishibashi

Sano

et al. 2022

Polymers for Advanced Techs

Self Cite

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“…The thickness of the wall with respect to the size of the capsules, [24] has an important impact on the overall efficiency of the delivery system. Microcapsules A-F were all prepared with a constant shell/core ratio of 0.19.…”

mentioning

confidence: 99%

Controlled Release of Encapsulated Bioactive Volatiles by Rupture of the Capsule Wall through the Light‐Induced Generation of a Gas

et al. 2015

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The encapsulation of photolabile 2-oxoacetates in core-shell microcapsules allows the light-induced, controlled release of bioactive compounds. On irradiation with UVA light these compounds degrade to generate an overpressure of gas inside the capsules, which expands or breaks the capsule wall. Headspace measurements confirmed the light-induced formation of CO and CO2 and the successful release of the bioactive compound, while optical microscopy demonstrated the formation of gas bubbles, the cleavage of the capsule wall, and the leakage of the oil phase out of the capsule. The efficiency of the delivery system depends on the structure of the 2-oxoacetate, the quantity used with respect to the thickness of the capsule wall, and the intensity of the irradiating UVA light.

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Strategies to Immobilized Catalysts

Piermatti

Abu‐Reziq

Vaccaro

2019

Catalyst Immobilization

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Shell thickness and chemical structure of polyurea microcapsules prepared with haxamethylene diisocyanate uretidione and isocyanurate

Cited by 8 publications

References 10 publications

Preparation and characterization of pesticide Fosthiazate‐loaded microcapsules for controlled release system

Preparation and characterization of pesticide Fosthiazate‐loaded microcapsules for controlled release system

Controlled Release of Encapsulated Bioactive Volatiles by Rupture of the Capsule Wall through the Light‐Induced Generation of a Gas

Strategies to Immobilized Catalysts

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