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Enhancing the thermal stability of α-Diimine Ni(II) catalysts for ethylene polymerization via symmetrical axial shielding strategy by Luyao Wang; Ming Liu; Qaiser Mahmood; Shifang Yuan; Xiaoxu Li; Lidong Qin; Song Zou; Tongling Liang; Wen-Hua Sun is a scholarly article available to read on EtoBox.

What is Enhancing the thermal stability of α-Diimine Ni(II) catalysts for ethylene polymerization via symmetrical axial shielding strategy about?

Targeting practical complex catalyst for ethylene polymerization, the catalytic system requires a good thermo-stability along with high activity as well as reasonable molecular weights of resultant polyethylene. Herein, a series of symmetrical α-diimine-nickel complexes bearing functionalized 2,6-dibenzhydryl-4-t-butylphenyl Naryl were prepared and examined in detail for ethylene polymerization, and compared the catalytic performance with their unsymmetrical analogues. The symmetrical catalysts displayed high activities in the level of 10 6 g mol -1 h -1 , producing high molecular weight branched polyethylene (Mw: > 1.79 × 10 5 g mol -1 ) at all the reaction temperatures ranging from 30 • C to 100 • C, in comparison, both classical and unsymmetrical α-diimine-nickel analogues gave low activities and became completely inactive at 100 • C under similar conditions. It was proposed that π-π interactions between the acenaphthylene and phenyl of benzahydral group suppress the N-aryl rotation and thereby generate a blockage around the metal center by interlocking the axial positions, which in result significantly improve the thermal stability of the nickel complex catalysts.

Author

Luyao Wang; Ming Liu; Qaiser Mahmood; Shifang Yuan; Xiaoxu Li; Lidong Qin; Song Zou; Tongling Liang; Wen-Hua Sun

Publisher

Elsevier BV

Published

2023

Language

EN