Tan, C. and Chen, C. (2019) Emerging Palladium and Nickel Catalysts for Copolymerization of Olefins with Polar Monomers. Angewandte Chemie, 131, 7268-7276.
https://doi.org/10.1002/ange.201814634

has been cited by the following article:

• TITLE: Synthesis of Branched Polyethylene via Bulky α-Diimine Nickel(II)-Catalyzed Ethylene Chain-Walking Polymerization

  AUTHORS: Zhengquan Dong, Pei Li, Guoyong Xu, Fuzhou Wang

  KEYWORDS: Ethylene Polymerization, α-Diimine Ni(II) Complex, Chain-Walking Polymerization, Branched Polyethylene

  JOURNAL NAME: Open Journal of Organic Polymer Materials, Vol.13 No.1, June 19, 2024

  ABSTRACT: The catalysis of olefin polymerization through the chain-walking process is a subject of great interest. In this contribution, the successful synthesis of a Brookhart-type unsymmetrical α-diimine nickel catalyst Ni, which contains both dibenzhydryl and phenyl groups, was determined by X-ray crystallography. The compound has a pseudo-tetrahedral geometry at the Ni center, showing pseudo-C2-symmetry. Upon activation with modified methylaluminoxane (MMAO), Ni1 exhibits high catalytic activity up to 1.02 × 107 g PE (mol Ni h)−1 toward ethylene polymerization, enabling the synthesis of high molecular weight branched polyethylene. The molecular weights and branching densities could be tuned over a very wide range. The polymerization results indicated the possibility of precise microstructure control, depending on the polymerization temperature. The branching densities were decreased with increasing the polymerization temperature.