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Miniemulsion polymerizations of styrene in the presence of two reversible addition-fragmentation chain-transfer (RAFT) agents were studied. The rates were significantly retarded by the presence of a RAFT agents S-(thiobenzoyl)thioglycolic acid, 1, or dithiobenzoic acid 1-phenylethyl ester, 2. Control in miniemulsion polymerization is not as good as for bulk polymerizations. The miniemulsions could also be stabilized against Ostwald ripening by a polymer terminated by a dithiobenzoic moiety. In this case, the polymerization was not controlled because of the generation of renucleated particles.

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SUMMARY A new type of reactive surfactant, containing both a methacrylic and a maleic group, was prepared and engaged in batch and seeded emulsion polymerization of styrene and styrene-butyl acrylate. The stability of core-shell latexes versus electrolytes has been studied.

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