期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 32, 页码 17446-17451出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106682
关键词
heterogenization; morphology; nickel; polar functionalization; polyolefins
资金
- National Natural Science Foundation of China [22071023, 52025031, U1904212]
- Fundamental Research Funds for the Central Universities [2232020A-05]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- K.C. Wong Education Foundation
In this study, Ni/SiO2 and Pd/SiO2 heterogeneous catalysts were synthesized, with Ni/SiO2 showing high activity in the copolymerization of ethylene with 5-hexene-1-yl-acetate, and Pd/SiO2 mediating ethylene copolymerization with polar monomers with tunable comonomer incorporation.
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/SiO2) and palladium (Pd/SiO2) catalysts through hydrogen bonding interactions of the ligands with the silica surface. Ni/SiO2 exhibits high activities (up to 2.65x10(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/SiO2 can mediate ethylene copolymerization with polar monomers with moderate activity to produce high-molecular-weight copolymers with tunable comonomer incorporation.
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