Nanoencapsulation via interfacially confined reversible addition fragmentation transfer (RAFT) miniemulsion polymerization

Luo, Yingwu; Gu, Haiting

doi:10.1016/j.polymer.2007.03.042

Cited by 71 publications

(79 citation statements)

References 51 publications

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“…As the particles are washed by decantation and dried under vacuum, multihollow particles are developed. Miniemulsion has been found as a feasible technique to encapsulate hydrophobic and hydrophilic materials in 50-500 nm polymer nanocapsules [23][24][25]. One of the major drawbacks of the emulsion-based processes is that they require numerous steps and very long process time.…”

Section: Introductionmentioning

confidence: 99%

Inverse Free Radical Suspension Polymerization as a Potential Means to Encapsulate Biologically Active Materials

Luciani¹,

Choi²,

Xiao³

2010

Chem Eng & Technol

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Some recent advances in the production of hollow polymer particles at room temperature via inverse suspension polymerization are presented. Although suspension polymerization has been used for years to produce solid microspheres, there is a lack of information regarding its application in the production of polymer microcapsules when an intraparticle phase separation is induced during the course of polymerization. As a model system, the inverse suspension copolymerization of acrylamide, neutralized methacrylic acid, and N,N-methylenebisacrylamide in cyclohexane at low temperature was investigated. The effects of the composition of the disperse phase and stabilizer on the final particle morphology were studied. The results were interpreted by means of a qualitative model. Due to the low temperature of the reaction and the use of water-soluble monomers, the investigated suspension polymerization can be also regarded as a potentially attractive technique to encapsulate biologically active materials.

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Section: Introductionmentioning

confidence: 99%

Inverse Free Radical Suspension Polymerization as a Potential Means to Encapsulate Biologically Active Materials

Luciani¹,

Choi²,

Xiao³

2010

Chem Eng & Technol

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“…Hollow particle synthesis has previously been reported using ATRP [60,61] and RAFT. [62][63][64][65][66] The present results demonstrate that the SaPSeP method is applicable also to NMP systems, thus providing a convenient synthetic route to hollow polymer particles with a shell of comprising crosslinked polymer of high network homogeneity. As explained in the Introduction, cross-linking radical polymerization based on a controlled/living mechanism results in networks of high homogeneity with minimal (if any) formation of local domains of very high cross-link density (microgels), the latter being a characteristic feature of networks prepared by conventional radical polymerization.…”

Section: Hollow Particlesmentioning

confidence: 89%

Gelation and Hollow Particle Formation in Nitroxide‐Mediated Radical Copolymerization of Styrene and Divinylbenzene in Miniemulsion

Zetterlund

Saka

Okubo

2009

Macro Chemistry & Physics

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Network formation in the nitroxide‐mediated cross‐linking copolymerization of styrene and divinylbenzene (3 or 8.2 mol‐% relative to total monomer) using the nitroxide 2,2,6,6‐tetramethylpiperidinyl‐1‐oxy (TEMPO) at 125 °C can proceed markedly differently in aqueous miniemulsion compared to the corresponding solution polymerization depending on the organic‐phase composition. When the organic phase comprises 54 vol‐% of the hydrophobe tetradecane, gelation occurs at much lower conversion in miniemulsion than in solution, and at significantly lower conversion than predicted by Flory–Stockmayer gelation theory. This is proposed to be a result of an effect of the oil–water interface, whereby the concentration of polymer with pendant unsaturations is higher near the interface than in the particle interior.magnified image

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“…According to the targeted applications and experimental conditions, several particles morphologies can be designed such as core-shell and hollow particles. RAFT miniemulsion polymerization has recently proven to be an efficient technique to synthesize nanocapsules, as reported by Luo and co-workers [180][181][182] who developed amphiphilic macroRAFT agents to both control and stabilize interfacially confined miniemulsion polymerization. They first used styrene and maleic anhydride oligomers (SMA-RAFT) synthesized by PEPDTA-mediated RAFT copolymerization [180,182].…”

Section: Nanocapsules Synthesized By Raft Miniemulsion Polymerizationmentioning

confidence: 94%

Controlled/Living Radical Polymerization in Aqueous Miniemulsion

Lefay

Nicolas

2010

Miniemulsion Polymerization Technology

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Nanoencapsulation via interfacially confined reversible addition fragmentation transfer (RAFT) miniemulsion polymerization

Cited by 71 publications

References 51 publications

Inverse Free Radical Suspension Polymerization as a Potential Means to Encapsulate Biologically Active Materials

Inverse Free Radical Suspension Polymerization as a Potential Means to Encapsulate Biologically Active Materials

Gelation and Hollow Particle Formation in Nitroxide‐Mediated Radical Copolymerization of Styrene and Divinylbenzene in Miniemulsion

Controlled/Living Radical Polymerization in Aqueous Miniemulsion

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