ChemCatChem, Год журнала: 2024, Номер unknown

Опубликована: Дек. 28, 2024

Abstract The chain‐walking mechanism, coupled with β ‐elimination reactions, establishes nickel complexes as a unique class of catalysts in olefin polymerization, giving access to variety polyethylene products from only ethylene monomer. In this study, set 8‐(2,6‐bis(aryl)‐3,4,5‐trifluorophenyl)imino‐5,6,7‐trihydroquinoline‐nickel bromide [aryl = Ph 2 CH for Ni H , (4‐FPh) F (4‐ClPh) Cl (4‐MePh) Me (4‐ t BuPh) Bu ] was designed, prepared, and investigated polymerization. Upon activation MAO, these precatalysts exhibited high catalytic activity (as 3.1 × 10 6 g mol −1 h ) produced tunable chain walking (branching degree 58–90/1000C), transfer (polymer M w 0.7–2.8 kg ), termination reactions (vinylene/vinyl 83.4%–93.6%). Electron‐donating groups at benzhydryl aniline showed positive influence on the rate monomer insertion propagation, resulting polymer molecular weights. Change reaction temperature resulted varied physical states sticky wax thick oil. Most importantly, is predominant route produces ratio internal double bonds (─CH═CH─/CH ═CH─ up 93.6%). These macromers are important post‐modification processes.

Язык: Английский