Ethylene–styrene diblock copolymers: Synthesis by Ziegler–Natta catalysis and identification

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Abstract
A new way of directly synthesizing ethylene–styrene diblock copolymer by Ziegler–Natta catalysis was studied. It consists of using a soluble complex prepared by the reaction of with TiCl4 in the ratio r = [Li]/[Ti] = 2 to initiate the formation of the polyethylene block. The well‐defined linear diblock structure was established both by GPC of the polyethylene block and by 13C NMR and DSC analyses of the copolymer. Moreover, by using such a catalytic system, the efficiency was found to be 0.88 with respect to carbon‐titanium bond. This value is relatively high compared to those of conventional Ziegler‐Natta catalytic systems.