Miniemulsion polymerization

Asúa, José M.

doi:10.1016/s0079-6700(02)00010-2

Cited by 929 publications

(761 citation statements)

References 205 publications

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“…It can be seen that the number of particles is lower than the number of miniemulsion droplets for the standard acrylic latexes, but the number is higher for the hybrids. The cause of this difference was the lower stability of the standard acrylic miniemulsions as compared to the hybrid miniemulsions (due to the effect of PU in reducing the Ostwald ripening effect 59 ). In the case of the stable hybrid miniemulsions, the number of polymer particles was higher than that of the miniemulsion droplets, the effect being more noticeable in the presence of MMA.…”

Section: (C) (D) (F) (E)mentioning

confidence: 99%

Waterborne Polyurethane−Acrylic Hybrid Nanoparticles by Miniemulsion Polymerization: Applications in Pressure-Sensitive Adhesives

et al. 2011

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Abstract. Waterborne polyurethane-acrylic hybrid nanoparticles for application as pressuresensitive adhesives (PSAs) were prepared by a one-step miniemulsion polymerization. The addition of polyurethane into a standard waterborne acrylic formulation results in a large increase of the cohesive strength and hence a much higher shear holding time (greater than seven weeks at room temperature), which is a highly desirable characteristic for PSAs. However, with the increase in cohesion, there is a decrease in the relative viscous component, and hence there is a decrease in the tack energy. The presence of a small concentration of methyl methacrylate (MMA) in the acrylic copolymer led to phase separation within the particles and created a hemispherical morphology. The tack energy was particularly low in the hybrid containing MMA because of the effects of lower energy dissipation and greater crosslinking. These results highlight the great sensitivity of the * Corresponding author. E-mail: j.keddie@surrey.ac.uk. Tel +44-1483-686803; Fax +44-1483- 686781.Published in Langmuir (2011) 27(7) pp 3878-3888 2 viscoelastic and adhesive properties to the details of the polymer network architecture and hence to the precise composition and synthesis conditions.

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Section: (C) (D) (F) (E)mentioning

confidence: 99%

Waterborne Polyurethane−Acrylic Hybrid Nanoparticles by Miniemulsion Polymerization: Applications in Pressure-Sensitive Adhesives

et al. 2011

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“…Additionally, the miniemulsion process enables the production of polymeric nanoparticles with unique characteristics and vast commercial interest. [16][17][18][19][20][21] Thiol-ene step-growth polymerization in miniemulsion is currently being investigated and only a handful of articles have been published in the literature. [14][15][16][22][23][24] Furthermore, works portraying the polymerization of renewable monomers through thiol-ene polymerization in aqueous dispersed medium are still uncommon.…”

Section: Introductionmentioning

confidence: 99%

Biocompatible Polymeric Nanoparticles From Castor Oil Derivatives via Thiol‐Ene Miniemulsion Polymerization

Cardoso

Machado²,

Feuser³

et al. 2017

Euro J Lipid Sci & Tech

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Biocompatible polymeric nanoparticles are obtained via thiol-ene polymerization of a biobased monomer in miniemulsion. The α,ω-diene-diester monomer is synthesized through esterification reaction of a glycerol derivative, namely 1,3-propanediol, with 10-undecenoic acid, a long-chain diene carboxylic acid. In order to investigate how different monomeric structures behave toward thiolene polymerization in miniemulsion, two types of thiols are investigated: 1,4-butanedithiol and 2-mercaptoethyl ether. Poly(thioether-ester)s with weight average molecular weight up to 15 kDa (M n ) are obtained, depending on initiator concentration and types of surfactant and dithiol employed. Finally, biobased poly(thioether-ester) nanoparticles are submitted to cytotoxicity and hemolysis analyses. High cell viability and no significant changes in cell morphology are observed after the incubation on murine fibroblast (L929) and human cervical cancer cells (HeLa). Last, hemolysis assays revealed blood compatibility and therefore polymeric nanoparticles have been shown to be a potential alternative drug delivery vector for intravenous administration. Practical Applications: There is a great demand for polymeric systems that fulfill a number of requirements, such as biodegradability and biocompatibility, for biomedical applications. In this context, biobased polymers obtained from vegetable oils are a very attractive sustainable alternative to fossil-derived polymeric materials, presenting potential biodegradability and low toxicity. By thiol-ene reactions, polymeric materials containing ester groups in the main chain -which can undergo hydrolysis-can be prepared in miniemulsion, enabling their degradation in physiological environment and, therefore, being interesting for biomedical applications and material disposal. Such novel materials could be used in temporary implants, tissue engineering, and drug delivery systems.

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“…Para sintetizar nano-hidrogéis por meio de polimerizações com reticulação, é quase sempre necessário usar um sistema inverso; ou seja, um sistema em que a fase contínua seja de caráter apolar e a fase dispersa polar, estabilizada por um surfactante lipofílico [13] . Quando se deseja carregar as nanopartículas com produtos orgânicos ou inorgânicos, solúveis ou não no meio reacional, o sistema heterogêneo de polimerização mais viável para sintetizar essas nanopartículas híbridas [131][132][133] é a polimerização em miniemulsão, em função da facilidade para dispersar o meio reacional na presença de outros materiais, solubilizados ou não na carga de monômeros [134,135] . Por isso, não surpreende que os nano-hidrogéis sejam produzidos majoritariamente por miniemulsões inversas.…”

Section: Aplicações Em Biotecnologiaunclassified

Polimerização RAFT em Miniemulsão

Oliveira¹,

Nele²,

Pinto³

2013

Polímeros

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Resumo: Dentre as diversas técnicas para obter polímeros de maneira controlada, a técnica de Transferência Reversível de Cadeia por Adição-Fragmentação (RAFT) é tida como uma das mais versáteis, uma vez que é compatível com uma grande quantidade de monômeros, solventes, condições reacionais e sistemas de polimerização. Utilizando essa metodologia, é possível sintetizar polímeros com diversas arquiteturas e com excelente controle do tamanho das cadeias. Neste trabalho, é apresentada uma revisão da técnica de polimerização RAFT em sistemas de miniemulsão. As principais características da técnica de polimerização RAFT e uma ampla revisão dos estudos em miniemulsão são apresentadas, abrangendo mais de 152 referências. Também é abordado nesta revisão o uso da polimerização RAFT em miniemulsão para obtenção de polímeros para aplicações biotecnológicas. Palavras-chave: Polimerização, RAFT, miniemulsão, biotecnologia, nanopartículas. RAFT Polymerization in MiniemulsionsAbstract: Among the many techniques used to prepare polymers in a controlled manner, reversible addition fragmentation chain transfer polymerization (RAFT) is one of the most versatile, since this technique is compatible with a large number of monomers, solvents, reaction conditions and polymerization systems. Using this methodology, it is possible to synthesize polymers with a variety of architectures and with a high level of control of the molecular weight distribution. In this work, a review of RAFT polymerizations in miniemulsion systems is presented. The main characteristics of the RAFT polymerization technique and a comprehensive review of studies in miniemulsion are presented, comprising more than 152 references. The use of RAFT miniemulsion polymerizaton to obtain polymers for biotechnological applications is also discussed in detail. Keywords: Polymerization, RAFT, miniemulsion, biotechnology, nanoparticles. IntroduçãoO século XX foi particularmente impactante na sociedade contemporânea, especialmente com o advento da Química Moderna e seus inúmeros avanços, como a identificação das macromoléculas [1,2] e o desenvolvimento de inúmeras técnicas de polimerização [3] , que criaram um novo campo de pesquisa: a Ciência de Polímeros. Esse novo campo de pesquisa permitiu a criação de uma nova classe de materiais sintéticos, vulgarmente conhecidos como plásticos, que são empregados hoje nos mais variados tipos de aplicações, incluindo desde a confecção de embalagens para alimentos até dispositivos nanométricos usados no tratamento de doenças [4][5][6] . Os polímeros sintéticos são normalmente obtidos por reações de polimerização, que seguem usualmente os bem conhecidos mecanismos de polimerização em cadeia ou em etapas. Dentre os diversos processos disponíveis, as técnicas de polimerização via radicais livres (mecanismo em cadeia) são largamente empregados em plantas industriais para a síntese de polímeros. Isto se deve principalmente a algumas vantagens das reações via radicais livres frente a outros métodos de polimerização, sendo possível citar: (...

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Miniemulsion polymerization

Cited by 929 publications

References 205 publications

Waterborne Polyurethane−Acrylic Hybrid Nanoparticles by Miniemulsion Polymerization: Applications in Pressure-Sensitive Adhesives

Waterborne Polyurethane−Acrylic Hybrid Nanoparticles by Miniemulsion Polymerization: Applications in Pressure-Sensitive Adhesives

Biocompatible Polymeric Nanoparticles From Castor Oil Derivatives via Thiol‐Ene Miniemulsion Polymerization

Polimerização RAFT em Miniemulsão

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