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Ligand steric effects on naphthyl-α-diimine nickel catalyzed α-olefin polymerization

Authors
  • Wang, Fu-Zhou1
  • Tian, Su-Su1
  • Li, Rui-Ping1
  • Li, Wei-Min1
  • Chen, Chang-Le2
  • 1 Changzhou University, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Pertrochemical Engineering, Changzhou, 213164, China , Changzhou (China)
  • 2 University of Science and Technology of China, Chinese Academy of Sciences Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei, 230026, China , Hefei (China)
Type
Published Article
Journal
Chinese Journal of Polymer Science
Publisher
Chinese Chemical Society and Institute of Chemistry, CAS
Publication Date
Nov 04, 2017
Volume
36
Issue
2
Pages
157–162
Identifiers
DOI: 10.1007/s10118-018-2038-6
Source
Springer Nature
Keywords
License
Yellow

Abstract

Naphthyl-a-diimine nickel complexes with systematically varied ligand sterics, activated by modified methylaluminoxane (MMAO), were tested in the polymerization of higher a-olefin (1-hexene, 1-decene and 1-hexadecene) under suitable conditions. The polymerization results indicated the possibility of precise microstructure control, depending on catalyst structure, polymerization temperature, monomer concentration and types of monomers, which in turn strongly affects the resultant polymer properties. Naphthyl-a-diimine nickel complex bearing chiral bulky sec-phenethyl groups in the o-naphthyl position showed good catalytic activity, and resulted in branched polymers (42-88/1000C) with high molecular weights (Mn: (4.3-15.2) × 104 g·mol-1) and narrow molecular weight distribution (Mw/Mn = 1.13-1.29, RT), which suggested a living polymerization. The increasing steric hindrance of catalyst leads to enhance insertion for 2,1-insertion of a-olefin and the chain-walking reaction.

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