Abstract
The formation of microphase separated structures in the confined space of latex particles is reported. Three different systems are investigated: emulsion polymerizations started either with polymeric radicals or with persulfate in the presence of ionic chain transfer agents, aqueous dispersions of well defined polystyrene model oligomers with sulfonate end groups, and miniemulsion polymerization in the presence of large amounts of preformed polymer in the droplets. In any of these cases microphase separation leads to the formation of inhomogeneities in the particles. Electron microscopy, atomic force microscopy, and X-ray absorption microscopy show identical structures and hence prove that the inhomogeneities already exit in the dispersed state.
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