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• W2921002009 abstract "Ten unsymmetrical N,N' ‐bis (imino) acenaphthene‐nickel (II) halide complexes, [1‐[2,6‐{(4‐MeOC 6 H 4 ) 2 CH} 2 –4‐MeC 6 H 2 N]‐2‐(ArN)C 2 C 10 H 6 ]NiX 2 , each appended with one N ‐2,6‐bis(4,4'‐dimethoxybenzhydryl)‐4‐methylphenyl group, have been synthesized and characterized. The molecular structures of Ni1 , Ni3 , Ni5 and Ni6 highlight the variation in steric protection afforded by the inequivalent N ‐aryl groups; a distorted tetrahedral geometry is conferred about each nickel center. On activation with diethylaluminum chloride (Et 2 AlCl) or methylaluminoxane (MAO), all complexes showed high activity at 30°C for the polymerization of ethylene with the least bulky bromide precatalysts ( Ni1 and Ni4 ), generally the most productive, forming polyethylenes with narrow dispersities [ M w / M n : < 3.4 (Et 2 AlCl), < 4.1 (MAO)] and various levels of branching. Significantly, this level of branching can be influenced by the type of co‐catalyst employed, with Et 2 AlCl having a predilection towards polymers displaying significantly higher branching contents than with MAO [ T m : 33.0–82.5°C (Et 2 AlCl) vs. 117.9–119.4°C (MAO)]. On the other hand, the molecular weights of the materials obtained with each co‐catalyst were high and, in some cases, entering the ultra‐high molecular weight range [ M w range: 6.8–12.2 × 10 5 g mol −1 (Et 2 AlCl), 7.2–10.9 × 10 5 g mol −1 (MAO)]. Furthermore, good tensile strength ( ε b up to 553.5%) and elastic recovery (up to 84%) have been displayed by selected more branched polymers highlighting their elastomeric properties." @default.
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• W2921002009 date "2019-03-08" @default.
• W2921002009 modified "2023-09-26" @default.
• W2921002009 title "Alkylaluminum activator effects on polyethylene branching using a <i>N,N′</i> ‐nickel precatalyst appended with bulky 4,4′‐dimethoxybenzhydryl groups" @default.
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• W2921002009 doi "https://doi.org/10.1002/aoc.4785" @default.
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