Premium
Production of Core–shell Particles by Combined Semibatch Emulsion/Suspension Polymerizations
Author(s) -
Besteti Marina Damião,
Freire Denise Maria Guimarães,
Pinto José Carlos
Publication year - 2011
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201100012
Subject(s) - suspension (topology) , emulsion polymerization , emulsion , monomer , polymer , shell (structure) , materials science , chemical engineering , suspension polymerization , polymer chemistry , core (optical fiber) , glass transition , polymerization , porosity , composite material , mathematics , homotopy , pure mathematics , engineering
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.