Design of thermally stable amine-imine nickel catalyst precursors for living polymerization of ethylene: effect of ligand substituents on catalytic behavior and polymer properties.

  • Haibin Hu, Lei Zhang, Haiyang Gao, Fangming Zhu, Qing Wu
  • Published 2014 in Chemistry

Abstract

Nickel complexes bearing amine-imine ligands with various backbone substituents were synthesized and employed as ethylene polymerization catalysts on activation with Et2 AlCl. The substituent on the backbone carbon atom of the amine moiety is decisive for the living nature of ethylene polymerization. A bulky amine-imine nickel precursor with a tert-butyl group on the carbon atom of the amine group can polymerize ethylene in a living fashion at an elevated temperature of 65 °C, which is the highest temperature of living polymerization of ethylene with late transition-metal catalysts. The wide applicable temperature range for living polymerization and sensitivity of the branch structure of the polyethylene to temperature enable precise synthesis of di- and triblock polyethylenes featuring different branched segments by sequential tuning of the polymerization temperature.

DOI: 10.1002/chem.201303813

Cite this paper

@article{Hu2014DesignOT, title={Design of thermally stable amine-imine nickel catalyst precursors for living polymerization of ethylene: effect of ligand substituents on catalytic behavior and polymer properties.}, author={Haibin Hu and Lei Zhang and Haiyang Gao and Fangming Zhu and Qing Wu}, journal={Chemistry}, year={2014}, volume={20 11}, pages={3225-33} }