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Ultrasonically initiated emulsion polymerization of styrene was carried out in the presence of Fe 2+ . The addition of a small amount of Fe 2+ markedly enhanced the polymerization rate of styrene. In the presence of 50μM Fe 2+ , the conversion of monomer in the reaction time of 60min was 2.4 times as high as that in the absence of Fe 2+ . The increase in the polymerization...
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