Abstract
Colloidally stable acrylic microgels in low dielectric organic media have been of interest in various surface coating applications. A convenient method for preparing such dispersions in organic solvents would be to redisperse dried aqueous emulsion polymer particles in the organic medium of choice. We have found that, while particles prepared using persulfate initiators cannot be directly redispersed in solvents such as heptane to yield colloidally stable microgels, those prepared using 4,4'-azobis(4-cyanovaleric acid) as the initiator can, and yield extremely stable dispersions in heptane. Such stability or lack of it can be directly attributed to the presence of weak or strong ionic surface groups and hence to the surface charge densities of the particles.
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