AI Article Synopsis
- Borohydrido-halflanthanidocene and dialkylmagnesium combinations are effective catalysts for the polymerization of isoprene and its copolymerization with styrene.
- Transmetalation occurs during the copolymerization process, allowing for increased insertion of styrene when using more dialkylmagnesium.
- This method offers a novel approach to control the composition of the resulting copolymer by manipulating chain transfer during metal-catalyzed reactions.
Article Abstract
Borohydrido-halflanthanidocene/dialkylmagnesium combinations are found to be powerful catalytic systems for the chain transfer polymerization of isoprene and its copolymerization with styrene. A behavior close to a lanthanide catalyzed polyisoprene chain growth on magnesium is reported. Transmetalation is further shown to occur in the course of the statistical copolymerization of isoprene and styrene. For the same monomer feed, the amount of styrene inserted in the copolymer can be increased by a factor 3 using 10 equiv. dialkylmagnesium versus 1 in the range of our experimental conditions. Chain transfer in the course of a metal catalyzed statistical copolymerization may thus be viewed as a new and original way for the control of the composition of a copolymer.
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| http://dx.doi.org/10.1002/marc.200800734 | DOI Listing |
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