Effect of coumarin backbone in N^O type nickel catalyzed olefin polymerization

Qasim, Muhammad; Tian, Wanlu; Pang, Wenmin; Pan, Yao; Behzadi, Shabnam; Chen, Min

doi:10.1016/j.eurpolymj.2022.111808

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…Imine based late‐transition metal catalysts have a distinctive status in ethylene home and co‐polymerization 1–3 . A range of ligands such as, α ‐diimine, 4–10 salicylaldimines, 11–18 imino‐pyridyl, 19–25 keto‐imine, 26,27 iminopyridine‐ N ‐oxide, 28,29 pyrrole‐imines 30 and pyrazolyl‐imines 31–33 have been synthesized by simple condensation method. A literature survey revealed that, any structural modification either in the amines or carbonyl containing backbone has characteristic influence not only on the catalyst performance but also on the polymer properties such as, molecular weight and microstructure 34–43 .…”

Section: Introductionmentioning

confidence: 99%

Ethylene homo and co‐polymerization catalyzed by extensively bulky nickel catalysts with shielding wings of chlorine atoms

Ahmad,

Wang,

Tian

et al. 2024

Journal of Polymer Science

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Designing the catalysts to get high molecular weight polyethylene is an art. The catalysts bearing imine functionality derived from 8‐arylnaphthyl amines are more impressive and attractive in this regard. In this work, we synthesize 2,4‐dibenzhydryl‐8‐(3,5‐dichlorophenyl)naphthalen‐1‐amine to condense with picolinaldehyde, pyridine‐N‐oxide‐2‐carbaldehyde and 3,4‐dibutanone and then subsequently the treatment of resulting ligands with nickel precursors to get the corresponding catalysts. It was hypothesized that 3,5‐dichlorophenyl having extended wings of chlorine atoms along with bulky dibenzhydryl groups can provide good shielding on both apical positions of metal in response to slow down the chain transfer. More interestingly, the polymerization was done in industrially claimed n‐heptane solvent. All the catalysts showed activity in an order of 106, whereas a value of 1.04 × 107 g mol−1 h−1 has been recorded from keto‐imine based Ni‐3 catalyst. All catalysts generates polymer with high molecular weight with maximum value was recorded by Ni‐2 up to 37.4 × 104 g mol−1. Ni‐3 can also incorporate methyl 10‐undecenoate up to 2.6% in polyethylene backbone.

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