Add time:08/31/2019         Source:sciencedirect.com

A series of α-diimine nickel complexes bearing para-benzhydryl groups, {[(2,6-R2-4-CHPh2C6H2N = C)2Nap]NiBr2, Nap: 1,8-naphthdiyl, R = Me (C1); R = Et (C2); R = iPr (C3)}, were synthesized and characterized. Upon activation with AlEt2Cl, these para-benzhydryl substituted catalysts conducted the ethylene and 1-decene polymerizations via controlled chain-walking process. These nickel complexes exhibited good thermal stability and high activities (up to 106 g PE (mol Ni h)−1) towards ethylene polymerization, producing high molecular weight polyethylenes with a relatively low degree of branching and narrow polydispersities (Mw/Mn ≤ 2.01). The catalytic activities [(0.81–2.42) × 106 g PE (mol Ni·h)−1], polyethylene molecular weights [Mn: (7.9–29.3) × 104 g mol−1] and total branching densities (57–102/1000C) can be tuned over a wide range. These controlled branching degrees of the obtained polyethylenes were decreased with increasing the bulkiness of the ligand and decreasing the polymerization temperature. Polymerization of 1-decene using these cationic nickel complexes generated branched poly(1-decene)s (69–87/1000C) with high molecular weights and narrow polydispersities (Mw/Mn = 1.18–1.55).

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