Abstract
The control of molecular weight of polymers in polymerization of styrene (St) with manganese(III) acetylacetonate [Mn(acac)3] in the presence of organic halides (RX) in toluene at 80°C was investigated. In the polymerizations of St with Mn(acac)3 in combination with benzyl bromide (BzBr) as RX, the molecular weight of the polymer increased with polymer yields, and the relationships between the molecular weight of polymer and polymer yield gave a straight line passing through the original point. However, the molecular weight distribution was not narrow, but kept almost constant (Mw/Mn was about 2) throughout the polymerization. The mechanism of the polymerization of St with Mn(acac)3-BzBr was also discussed.
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