Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 34, Pages 9948-9953Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201503708
Keywords
chain-walking polymerization; copolymerization; diimine ligands; palladium catalysis; polar monomers
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Funding
- National Natural Science Foundation of China (NSFC) [21374108]
- Fundamental Research Funds for the Central Universities [WK3450000001]
- Recruitment Program of Global Experts
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A series of sterically demanding alpha-diimine ligands bearing electron-donating and electron-withdrawing substituents were synthesized by an improved synthetic procedure in high yield. Subsequently, the corresponding Pd complexes were prepared and isolated by column chromatography. These Pd complexes demonstrated unique properties in ethylene polymerization, including high thermal stability and high activity, thus generating polyethylene with a high molecular weight and very low branching density. Similar properties were observed for ethylene/methyl acrylate copolymerization. Because of the high molecular weight and low branching density, the generated polyethylene and ethylene/methyl acrylate copolymer were semicrystalline solids. The (co)polymers had unique microstructures originating from the unique slow-chain-walking activity of these Pd complexes.
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