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Amidine/Phosphine‐Oxide‐Based Nickel Catalysts for Ethylene Polymerization and Copolymerization
Author(s) -
Zou Chen,
Tan Chen,
Pang Wenmin,
Chen Changle
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901114
Subject(s) - copolymer , polymer chemistry , nickel , catalysis , monomer , phosphine oxide , polymerization , materials science , chemistry , phosphine , polymer , organic chemistry
Abstract Nickel catalyzed copolymerization of olefins with polar co‐monomers remains a great challenge in the field of olefin polymerization. In this contribution, a series of amidine/phosphine‐oxide‐based ligands were synthesized and investigated for nickel catalyzed ethylene polymerization and copolymerization with polar co‐monomers. These nickel catalysts exhibited high catalytic activities (homopolymerization: up to 2.6×10 6 g (mol of Ni) −1 h −1 ; copolymerization: up to 1.0×10 5 g (mol of Ni) −1 h −1 ;) and good thermal stabilities at 80 °C, generating high‐molecular‐weight polyethylenes ( M n up to 8.45×10 4 g mol −1 ) as well as copolymers ( M n up to 2.19×10 4 g mol −1 ). The Ni center exhibited square planar geometry. The N atom between the imine and phosphine‐oxide moieties exhibited trigonal planar geometry, indicating electron‐donating conjugate effect of the sp 2 hybrid N‐atom linker. This electronic effect can increase the electron density on the nickel center and result in enhanced catalytic performance.