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Updated: Sep 22, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
Published on: November 27, 2015
Ligand-Unsymmetrical Phenoxyiminato Dinickel Catalyst for High Molecular Weight Long-Chain Branched Polyethylenes
Dongxu Shu1, Aidan R Mouat1, Casey J Stephenson1
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States.
Abstract:
An unsymmetrical bimetallic catalyst, (CF/SO)FI-Ni, having a CF3-functionalized phenoxyiminato Ni(II) center, which produces linear high-Mw polyolefin (CF/Ni) joined to an adjacent SO2-functionalized phenoxyiminato Ni(II) center, which produces highly branched low-Mw polyolefin (SO/Ni), was synthesized and fully characterized. In ethylene homopolymerizations, (CF/SO)FI-Ni affords monomodal (Đ = 1.7), highly, long-chain branched (69 branches/1000 C) polyethylenes with Mw = 24 kg/mol. In contrast, bimetallic (CF)FI-Ni and (SO)FI-Ni produce high-Mw (25 kg/mol) exclusively methyl-branched (40 branches/1000 C) and low-Mw (4.5 kg/mol) highly branched (105 branches/1000 C) polyethylenes, respectively, while tandem monometallic (CF)FI-Ni + (SO)FI-Ni catalyst mixtures yield a bimodal polyolefin mixture (Đ = 6.4).
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