J. Ueda, M. Matsuyama, M. Kamigaito
Jan 23, 1998
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0
Influential Citations
104
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Quality indicators
Journal
Macromolecules
Abstract
Bi- and trifunctional dichloroacetates were synthesized from the corresponding multifunctional alcohols or phenols and then employed as multifunctional initiators for the living radical polymerizations of methyl methacrylate mediated by RuCl2(PPh3)3 in the presence of aluminum compounds such as Al(OiPr)3 and Al(acac)3 (acac: acetylacetonate). All these systems led to living polymerizations. However, the systems with Al(OiPr)3 involved partial transesterification of the ester units in the initiators, which resulted in the formation of a monofunctional initiator. In contrast, new systems with Al(acac)3 did not induce such transesterification and produced the multiarmed living polymers. 1H NMR analysis showed that polymers obtained with the di- and trifunctional esters possessed almost two and three arms, respectively, along with controlled molecular weights and their narrow distributions.