Polyurea Microcapsules from Oil-in-Oil Emulsions via Interfacial Polymerization

Kobaslija, Muris; McQuade, D. Tyler

doi:10.1021/ma061455x

Cited by 82 publications

(64 citation statements)

References 18 publications

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“…These assembles are typically not robust (for example, vesicles that cannot be dried) or more importantly rely on covalent crosslinking to give a microcapsule structure, limiting the opportunities for controlled disassembly required for on-demand release of cargo. While there have been examples of microcapsules formed from interfacial polymerization 30,31 or crosslinking 32 of monomers at the interface of a microdroplet, the interfacial assembly of preformed polymeric materials to form multi-layer amphiphilic microcapsules has not yet been demonstrated. Supramolecular host-guest chemistry has been applied in the preparation of various self-assembled structures, including polymers 33,34 , micelles 35 , hydrogels 36,37 , colloids 38 and more recently by our group, microcapsules 39 .…”

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confidence: 99%

Interfacial assembly of dendritic microcapsules with host–guest chemistry

et al. 2014

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The self-assembly of nanoscale materials to form hierarchically ordered structures promises new opportunities in drug delivery, as well as magnetic materials and devices. Herein, we report a simple means to promote the self-assembly of two polymers with functional groups at a water-chloroform interface using microfluidic technology. Two polymeric layers can be assembled and disassembled at the droplet interface using the efficiency of cucurbit[8]uril (CB[8]) host-guest supramolecular chemistry. The microcapsules produced are extremely monodisperse in size and can encapsulate target molecules in a robust, well-defined manner. In addition, we exploit a dendritic copolymer architecture to trap a small hydrophilic molecule in the microcapsule skin as cargo. This demonstrates not only the ability to encapsulate small molecules but also the ability to orthogonally store both hydrophilic and hydrophobic cargos within a single microcapsule. The interfacially assembled supramolecular microcapsules can benefit from the diversity of polymeric materials, allowing for fine control over the microcapsule properties.

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confidence: 99%

Interfacial assembly of dendritic microcapsules with host–guest chemistry

et al. 2014

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“…Organic-inorganic hybrid hollow silica nanospheres [5] and hollow mesoporous silica nanoworms [6] were synthesized using a chiral cationic low-molecular-weight amphiphile as template. The formation of O/W emulsion is reasonable because the P123 micelles with n-decane solubilized inside as swelling agent can transform to emulsion droplets while excess amount of n-decane is used in the synthesis of hexagonally ordered materials [23][24][25][26][27]. In the synthesis process in current work, the residual water-rich layer is initially turbid right after the removal of decane-rich layer at room temperature but becomes clear and stable while its temperature was increased to 40°C.…”

Section: Resultsmentioning

confidence: 87%

“…1. Then, we can know that these onion-like silica spheres, with some parallel mesoporous tubes along their edge, are related to initial patterns of the cocoon-like pouches containing the wall constructed by hexagonally ordered channels [22][23][24][25][26][27]. Under static condition without stirring, the aggregation of the onion-like silica spheres is absent or proceeds very slowly and thus the hexagonally ordered structure can not be built [22].…”

Section: Resultsmentioning

confidence: 99%

Hierarchical fabrication of silica cocoon with hexagonally ordered channel constructed wall via an emulsion-assisted process

zhang

Wang

et al. 2012

Microporous and Mesoporous Materials

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“…Después de encontrar la mejor relación entre las variables, se realiza la optimización del tamaño de partícula evaluando como factores la cantidad de agente emulsificante O/W (alcohol polivinilico) y de fase dispersa, basado en trabajos anteriores [18][19] . Los valores obtenidos para los experimentos y sus propiedades se describen en la Tabla 3.…”

Section: Síntesis Y Caracterización De Las Microcápsulas De Poliureaunclassified

Síntesis de microcápsulas de poliurea a partir de aminas renovables, mediante doble emulsificación

Mazo

Ríos²,

Restrepo³

2011

Polímeros

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Resumen: En este trabajo se realizó la microencapsulación de un perfume comercial mediante una doble emulsificación, la coraza de poliurea fue sintetizada por la reacción de Lisina con dos diisocianatos comerciales, uno aromático y otro alifático. En la síntesis se evaluó el efecto que tiene la relación molar amina:diisocianato y el tipo de emulsificante. Se optimizó el tamaño de partícula utilizando un diseño factorial 3 2 y análisis de superficie de respuesta, las variables fueron: cantidad de alcohol polivinílico y la relación de fase dispersa a fase continua. Las microcápsulas se caracterizaron mediante: análisis de calorimetría diferencial de barrido (DSC), espectroscopía infrarroja (IR), microscopía electrónica de barrido (SEM) y tamaño medio de partícula. La doble emulsificación permite un mayor rendimiento de encapsulación del perfume, las micropartículas presentan un menor tamaño de partícula cuando: se emplea diisocianato aromático, un aumento de coloide protector (PVA) y una disminución de la fase dispersa. Palabras-claves: Microencapsulación, poliurea, lisina, poliglicerol poliricinoleato. Synthesis of Polyurea Microcapsules from Renewable Amines by Double EmulsificationAbstract: This paper reports on the microencapsulation of a commercial perfume by means of a double emulsification, where the polyurea shell was synthesized by the reaction of lysine with two commercial di-isocyanates (aromatic and aliphatic). In the synthesis the factors evaluated were the amine:di-isocyanate molar ratio and the type of emulsifier. The particle size was optimized using a 3 2 factorial design and response surface analysis, with the following variables: amount of polyvinyl alcohol and the relationship of the disperse phase to continuous phase. The microcapsules were characterized using differential scanning calorimetry analysis (DSC), infrared spectroscopy (IR), scanning electron microscopy (SEM) and mean particle size. The double emulsification allows for a greater yield in the encapsulation of perfume. Furthermore, the microparticles have a smaller particle size when the aromatic di-isocyanate was used, also leading to an increase in the protective colloid (polyvinyl alcohol (PVA)) and reduction of the disperse phase.

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Polyurea Microcapsules from Oil-in-Oil Emulsions via Interfacial Polymerization

Cited by 82 publications

References 18 publications

Interfacial assembly of dendritic microcapsules with host–guest chemistry

Interfacial assembly of dendritic microcapsules with host–guest chemistry

Hierarchical fabrication of silica cocoon with hexagonally ordered channel constructed wall via an emulsion-assisted process

Síntesis de microcápsulas de poliurea a partir de aminas renovables, mediante doble emulsificación

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