From Anionic to Ziegler-Natta Polymerization: Application to the Determination of the Reactivity of Ziegler-Natta Active Centers

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.