Miniemulsion Polymerization
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Efeito dos ácidos itacônico e fumárico na copolimerização em emulsão do estireno com acrilato de n-butila para produção de argamassa cimentícia
RESUMO Monômeros carboxílicos são frequentemente empregados em formulações de polímeros obtidos via polimerização em emulsão e miniemulsão visando melhorar ás propriedades de aplicação dos látexes. O objetivo deste trabalho foi avaliar o efeito dos ácidos itacônico IAI), fumárico (AF) e metacrílico (AMA) na copolimerização em emulsão do
Matéria (Rio J.). Publicado em: 16/09/2019
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2. Ultrasound assisted miniemulsion polymerization to prepare poly(urea-urethane) nanoparticles
Abstract Recently, the physical and chemical effects of ultrasound in polymeric materials synthesis have attracted great attention. This work presents the synthesis of novel polymeric materials by polymerization of isophorone diisocyanate with different polyols. Polymers were synthesized by step miniemulsion polymerizations, using ultrasound bath and thermo
Polímeros. Publicado em: 21/05/2018
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3. Waterborne hyperbranched alkyd-acrylic resin obtained by miniemulsion polymerization
Abstract Four waterborne hyperbranched alkyd-acrylic resins (HBRAA) were synthesized by miniemulsion polymerization from a hyperbranched alkyd resin (HBR), methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA), by using benzoyl peroxide (BPO) and ammonium persulfate (AP) as initiators. The reaction between HBR and acrylic monomers was evidence
Polímeros. Publicado em: 08/12/2016
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4. PARTICLE NUCLEATION USING DIFFERENT INITIATORS IN THE MINIEMULSION POLYMERIZATION OF STYRENE
Abstract In miniemulsion polymerization, droplet nucleation is the key factor to ensure the production of polymer particles with a desired composition. The influence of the initiation on droplet nucleation is conflicting and it has not been completely considered. The result of employing different initiator systems on the nucleation mechanism and kinetics in
Braz. J. Chem. Eng.. Publicado em: 2015-03
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5. Acrylamide inverse miniemulsion polymerization: in situ, real-time monitoring using nir spectroscopy
In this work, the ability of on-line NIR spectroscopy for the prediction of the evolution of monomer concentration, conversion and average particle diameter in acrylamide inverse miniemulsion polymerization was evaluated. The spectral ranges were chosen as those representing the decrease in concentration of monomer. An increase in the baseline shift indicate
Braz. J. Chem. Eng.. Publicado em: 2014-12
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6. Effect of tamoxifen in RAFT miniemulsion polymerization during the synthesis of polymer nanoparticles
Tamoxifen (TXF) is currently the only hormonal agent used for treatment of breast cancer. Although very effective, TXF presents low solubility in water, which affects its absorption and bioavailability. A common strategy to overcome this barrier is the formulation of a drug delivery system (DDS) in order to increase the drug stability and improve the treatme
Polímeros. Publicado em: 27/05/2014
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7. Preparation of poly(urethane-urea) nanoparticles containing açaí oil by miniemulsion polymerization
Polyurethane nanoparticles (NPs) are promising candidates for the controlled and targeted delivery of therapeutics in a variety of biomedical applications. In this work, a report is made of NPs produced by miniemulsion polymerization with isophorone diisocyanate (IPDI) and castor oil, glycerol, and poly(ethylene glycol) (PEG) with molar masses 400 and 1000 a
Polímeros. Publicado em: 27/08/2013
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8. Desenvolvimento e caracterização de nanocompósitos produzidos a partir de miniemulsão acrílica aquosa contendo nanopartículas de prata
Lately, the polymer latices have gained increasing importance having the great advantage of using water as a solvent, that reduces the emission of volatile organic compounds a big environmental concern. In the industry, the polymeric latices are obtained usually through an emulsion polymerization. They can also be obtained by the polymerization in miniemulsi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2011
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9. Síntesse de novos estabilizantes poliméricos do tipo poli(álcool vinilico-co-neo decanoato de vinila) para utilização na copolimerização em miniemulsão do acetato de vinila (VAc) com o neo-nonanoato de vinila (VEOVA-9) / Synthesis of new poly(vinyl alcohol-co-vinyl neodecanoate) based polymeric stabilizers, to be used in the miniemulsion copolymerizatin of vinyl acetate (VAc) with vinyl neononanoate (VEOVA-9).
Due to the technological and industrial importance of latexes stabilized with poly(vinyl alcohol)/PVA and the difficulties related to the emulsion polymerization of hydrophobic monomers and the use of PVA having a high degree of hydrolysis (>92%), the synthesis of new PVA based polymeric stabilizers for use in emulsion and miniemulsion polymerizations become
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/04/2010
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10. Estudo da copolimerização em mini emulsão de metacrilato de metila/metacrilato de etila / Study of methyl methacrylate/ethyl methacrylate in mini emulsion copolimerization
Reduction of volatile organic compounds (VOC) usage is a constant environmental demand. Polymeric aqueous emulsion of low surfactant contends produced from direct miniemulsion synthesis are used with advantages to replace organic solvents media as well as aqueous emulsions of high surfactant concentration. Water as continuous phase and organic monomers with
Publicado em: 2008
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11. Encapsulação de nanopartículas de magnetita em matriz de poli(metacrilato de metilacoácido metacrílico) por processo de polimerização em miniemulsão
Partículas magnéticas são sistemas com potencial de uso em liberação controlada fármacos, ferrofluidos e tratamentos de efluentes. Em muitas situações, como em aplicações biológicas, é necessário revestir as partículas magnéticas com um material orgânico, como polímeros. Neste trabalho, partículas magnéticas foram obtidas pelo revestimento
Publicado em: 2007