Novel Dinuclear Half-Titanocene-Producing Styrene/Ethylene Copolymers Containing Syndiotactic Styrene/Styrene Sequences

Abstract

The synthesis and characterization of a novel titanium complex, {[C(5)(CH(3))(5)]ClTi}(2)O(2)C(2)(CH(3))(4)(mu-O) (2), which has two titanium metal centers linked by heteroleptic bridges, oxo and pinacolato, is described. The compound shows good stability under air. The 2/modified methylalumoxane (MMAO) catalytic system produces ethylene/styrene interpolymers (ESIs) containing syndiotactic styrene/styrene sequences (syndiotactic polystyrene blocks) with a high styrene content. To the best of our knowledge, this is the first example of a group-4-based catalytic system producing an ESI with syndiotactic polystyrene blocks.