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Hydrogen‐Bonding‐Induced Heterogenization of Nickel and Palladium Catalysts for Copolymerization of Ethylene with Polar Monomers
Author(s) -
Zhang Hu,
Zou Chen,
Zhao Huipeng,
Cai Zhengguo,
Chen Changle
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202106682
Subject(s) - comonomer , copolymer , palladium , monomer , nickel , polymer chemistry , ethylene , catalysis , materials science , polyethylene , transition metal , chemistry , organic chemistry , polymer
The practical synthesis of polar‐functionalized polyolefins using transition‐metal‐catalyzed copolymerization of olefins with polar monomers is a challenge; the use of heterogeneous catalysts is little explored. Herein, we report the synthesis of heterogeneous naphthoquinone‐based nickel (Ni/SiO 2 ) and palladium (Pd/SiO 2 ) catalysts through hydrogen bonding interactions of the ligands with the silica surface. Ni/SiO 2 exhibits high activities (up to 2.65×10 6 g mol −1 h −1 ) during the copolymerization of ethylene with 5‐hexene‐1‐yl‐acetate, affording high‐molecular‐weight (M n up to 630 000) polar‐functionalized semicrystalline polyethylene (comonomer incorporation up to 2.8 mol %), along with great morphology control. The resulting copolymers possess improved surface properties and great mechanical properties. Pd/SiO 2 can mediate ethylene copolymerization with polar monomers with moderate activity to produce high‐molecular‐weight copolymers with tunable comonomer incorporation.