Produção Nacional
Revisado por pares
Production of Core–shell Particles by Combined Semibatch Emulsion/Suspension Polymerizations
2011; Wiley; Volume: 5; Issue: 9-10 Linguagem: Inglês
10.1002/mren.201100012
ISSN1862-8338
AutoresMarina Damião Besteti Ribeiro, Denise Maria Guimarães Freire, José Carlos Pinto,
Tópico(s)Pickering emulsions and particle stabilization
ResumoAbstract Core–shell polymer particles were produced by combined semibatch emulsion/suspension polymerizations, using different monomers. It is shown that the morphology of the shell depends on the glass transition temperature ( T g ) of the emulsified particles and that specific areas can vary considerably (7.9 to 37 m 2 · g −1 ), depending on reaction conditions and used monomers. Particularly, a thin film is formed around the core when the T g of the polymer that constitutes the shell is lower than the reaction temperature, while a porous shell is formed when the T g of the polymer material is higher than the reaction temperature. Based on the observed data, a physical model was proposed to explain the formation of core–shell particles by combination of typical suspension and emulsion polymerization recipes. magnified image
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