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• W2734635545 endingPage "1738" @default.
• W2734635545 startingPage "1731" @default.
• W2734635545 abstract "The copolymerization of ethylene and styrene can be efficiently carried out by using Cp* TiCl 2 (N = C t Bu 2 )/ MAO (Cp*= η 5 ‐ C 5 Me 5 ) system, yielding the poly(ethylene‐ co ‐styrene)s with isolated styrene units. In order to investigate the reasons for formation of the structure, the mechanism of copolymerization, especially the selective insertion of ethylene and styrene, is studied in detail by density functional theory ( DFT ) method. At the initiation stage, insertion of ethylene is kinetically more favorable than insertion of styrene, and insertion of styrene kinetically and thermodynamically prefers 2,1‐insertion. That is different from the conventional half‐titanocene system, in which the 1,2‐insertion is favorable. At chain propagation stage, the computational results suggest that the continuous insertion of styrene is hard to occur at room temperature due to the high free energy barriers (28.90 and 35.04 kcal/mol for 1,2‐insertion, and 29.15 and 34.00 kcal/mol for 2,1‐insertion) and thermodynamically unfavorable factors in two different conditions. That is mainly attributed to the steric hindrance between the coming styrene and chain‐end styrene or ketimide ligand. The computational results are in good agreement with the experimental data." @default.
• W2734635545 created "2017-07-21" @default.
• W2734635545 creator A5003027231 @default.
• W2734635545 creator A5015975417 @default.
• W2734635545 creator A5033329954 @default.
• W2734635545 creator A5047319094 @default.
• W2734635545 creator A5053075732 @default.
• W2734635545 date "2017-07-12" @default.
• W2734635545 modified "2023-10-14" @default.
• W2734635545 title "Selective Insertion in Copolymerization of Ethylene and Styrene Catalyzed by Half-Titanocene System Bearing Ketimide Ligand: A Theoretical Study" @default.
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