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Novel Dinuclear Half‐Titanocene‐Producing Styrene/Ethylene Copolymers Containing Syndiotactic Styrene/Styrene Sequences
Authors:Seung Woong Yoon  Youngjo Kim  Seong Kyun Kim  Sang Youl Kim  Youngkyu Do  Sungjin Park
Affiliation:1. Department of Chemistry, KAIST, Daejeon 305‐701, Korea;2. Department of Chemistry, Chungbuk National University, Cheongju 361‐763, Korea;3. Department of Chemistry, Inha University, Incheon 402‐751, Korea
Abstract:The synthesis and characterization of a novel titanium complex, {[C5(CH3)5]ClTi}2O2C2(CH3)4(µ‐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.
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Keywords:copolymerization  ethylene  metallocene catalysts  styrene  titanium
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