Abstract
Neutral nickel complexes containing an anilinobenzoic acid methyl ester ligand are prepared and applied for the ethylene polymerization and copolymerization with polar monomers. The complex C2 containing isopropyl substituent on the aniline ligand conducts ethylene polymerization with high activity and good thermal stability. Most importantly, the catalyst promotes the copolymerization of ethylene and polar monomers with high activity (up to 277 kg·mol−1·h−1), affording ester-functionalized semicrystalline polyethylene with reasonable polar monomer content (up to 3.20 mol %).
Highlights
Polyolefins have been extensively used in a wide range of application, the nonpolarity of polyolefins limits their further application [1]
This limitation could be dramatically improved by the introduction of even a small amount of polar functional groups to the polyolefin backbone [2]
Late-transition-metal catalysts based on palladium complexes have been extensively studied for olefin copolymerization with polar monomers [4,5,6,7,8,9,10,11]
Summary
Polyolefins have been extensively used in a wide range of application, the nonpolarity of polyolefins limits their further application [1] This limitation could be dramatically improved by the introduction of even a small amount of polar functional groups to the polyolefin backbone [2]. Late-transition-metal catalysts based on palladium complexes have been extensively studied for olefin copolymerization with polar monomers [4,5,6,7,8,9,10,11]. The significant interest was attracted in developing the neutral nickel catalysts because they exhibit higher tolerance toward functional polar groups [21]. Examples of SHOP type neutral nickel catalysts have been commercialized for the synthesis of α-olefins [22,23,24]
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