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- W2973057420 abstract "• Highly thermal stability (up to 80 °C). • Thermosensitive π-π interaction effect. • Polymer with tunable branching densities (13–46/1000C). • Polymer or copolymer with high melting point (up to 123 °C or 108 °C). Control of branching densities of polyolefins by polymerization conditions is a great challenge in the field of α-diimine palladium catalyzed olefin (co)polymerization. In this contribution, a series of acenaphthene-based highly sterically hindered α-diimine ligands bearing bulky diarylmethyl moiety and corresponding palladium catalysts have been designed, synthesized, characterized and investigated for ethylene polymerization and copolymerization with several polar monomers. The π-π interaction between the acenaphthene moiety and the phenyl of diarylmethyl moiety was observed. It was suggested that this π-π interaction could freeze the N-aryl-bond rotation at room temperature, resulting in the enhanced axial steric bulk as well as the low branching densities of the polyethylene products. In contrast, at high temperature, the π-π interaction was weaken and resulted in significantly increased branching densities of polyethylene products, indicating branching densities of polyolefins are adjustable within a wide range by polymerization conditions using this catalytic system." @default.
- W2973057420 created "2019-09-19" @default.
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- W2973057420 date "2019-10-01" @default.
- W2973057420 modified "2023-10-17" @default.
- W2973057420 title "π–π interaction effect in insertion polymerization with α-Diimine palladium systems" @default.
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- W2973057420 doi "https://doi.org/10.1016/j.jcat.2019.08.034" @default.
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