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The synthesis and characterization of latex particles consisting of a poly(styrene) (PS) core and a shell of linear poly(acrylic acid) (PAA) chains are described. The particles have been synthesized by photoemulsion polymerization of acrylic acid on PS core particles containing a thin shell of the photoinitiator 2-[ p -(2-hydroxy-2-methylpropiophenone)]−ethylene glycol−methacrylate (HMEM). The particles thus obtained have a defined core−shell morphology with a narrow size distribution. The dependence of the hydrodynamic radius of the fully dissociated PAA chains on the ionic strength is in qualitative accord with recent theoretical predictions.
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Guo et al. (1999) studied this question.
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