Abstract
Living anionic lithium-ended polymer is transformed into a soluble Ziegler-Natta Ti (III)/Li-based system. The latter exhibits a high efficiency as at least 80% of C-Ti bonds participate in the homo- and co-polymerization of ethylene and propene, leading to vinylicolefinic type block copolymers.
The “living character” of the Ziegler-Natta complexes is deduced from both the macromolecular features of the poly-olefinic blocks and the kinetic studies of C2H4 and C3H6 polymerizations.
From all the kinetic data obtained and on the basis of a two-steps propagation mechanism, the rate determining step is found to be complexation for C3H6 polymerization and insertion in the case of C2H4.
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Cansell, F., Siove, A., Fontanille, M. (1987). From Anionic to Ziegler-Natta Polymerization: Application to the Determination of the Reactivity of Ziegler-Natta Active Centers. In: Fontanille, M., Guyot, A. (eds) Recent Advances in Mechanistic and Synthetic Aspects of Polymerization. NATO ASI Series, vol 215. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3989-9_12
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DOI: https://doi.org/10.1007/978-94-009-3989-9_12
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