Synthesis and application of fluorinated α-diimine nickel catalyst for ethylene polymerization: deactivation mechanism

Ahmadjo, Saeid; Damavandi, Saman; Zohuri, Gholamhossein; Farhadipour, Abolghasem; Samadieh, N.; Etemadinia, Z.

doi:10.1007/s00289-017-1924-3

Cited by 15 publications

(14 citation statements)

References 34 publications

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“…10) possessing various backbone structures. 89,90 The acenaphthoquinone-based catalyst in ethylene polymerization exhibited a moderate activity of 1.4 × 10 4 g PE (mol Ni h) −1 (30°C, 30 min). 89 Despite the steric openness of these ligands, molecular weights of up to 2.48 × 10 5 g mol −1 with good crystallinity (58%) were generated.…”

Section: Fig 17mentioning

confidence: 99%

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A continuing legend: the Brookhart-type α-diimine nickel and palladium catalysts

2019

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Section: Fig 17mentioning

confidence: 99%

“…Structures of the CF 3 , methoxy substituted and fluorinated α-diimine-based Pd and Ni complexes [88][89][90]. Fig.…”

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confidence: 99%

A continuing legend: the Brookhart-type α-diimine nickel and palladium catalysts

2019

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“…This behaviour is mainly due to higher concentration of the monomer close to the active centre which has an effect on diffusion, site activation and also propagation rate . A nonlinear relationship between monomer pressure and activity was previously reported . However, higher pressure can cause a reverse effect on the catalyst activity especially by formation of latent sites or dormant sites…”

Section: Resultsmentioning

confidence: 88%

“…[39,40] A nonlinear relationship between monomer pressure and activity was previously reported. [41][42][43] However, higher pressure can cause a reverse effect on the catalyst activity especially by formation of latent sites or dormant sites. [42]…”

Section: Ethylene Polymerization Using Nickel-based Catalystmentioning

confidence: 99%

Single and binary catalyst systems based on nickel and palladium in polymerization of ethylene

Kimiaghalam

Nasr‐Isfahani

Zohuri

et al. 2017

Applied Organom Chemis

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The catalyst (N,N‐bis(2,6‐dibenzhydryl‐4‐ethoxyphenyl)butane‐2,3‐diimine)nickel dibromide, a late transition metal catalyst, was prepared and used in ethylene polymerization. The effects of reaction parameters such as polymerization temperature, co‐catalyst to catalyst molar ratio and monomer pressure on the polymerization were investigated. The α‐diimine nickel‐based catalyst was demonstrated to be thermally robust at a temperature as high as 90 °C. The highest activity of the catalyst (494 kg polyethylene (mol cat)−1 h−1) was obtained at [Al]/[Ni] = 600:1, temperature of 90 °C and pressure of 5 bar. In addition, the performance of a binary catalyst using nickel‐ and palladium‐based complexes was compared with that of the corresponding individual catalytic systems in ethylene polymerization. In a study of the catalyst systems, the average molecular weight and molecular weight distribution for the binary polymerization were between those for the individual catalytic polymerizations; however, the binary catalyst activity was lower than that of the two individual ones. The obtained polyethylenes had high molecular weights in the region of 105 g mol−1. Gel permeation chromatography analysis showed a narrow molecular weight distribution of 1.44 for the nickel‐based catalyst and 1.61 for the binary catalyst system. The branching density of the polyethylenes generated using the binary catalytic system (30 branches/1000 C) was lower than that generated using the nickel‐based catalyst (51/1000 C). X‐ray diffraction study of the polymer chains showed higher crystallinity with lower branching of the polymer obtained. Also Fourier transform infrared spectra confirmed that all obtained polymers were low‐density polyethylene.

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“…1). 29,30 A series of unsymmetrical α-diimine nickel complexes with an acenaphthene backbone and with one fluorinated N-aryl ring was synthesized (IV, Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Nickel and palladium complexes with fluorinated alkyl substituted α-diimine ligands for living/controlled olefin polymerization

et al. 2018

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Synthesis and application of fluorinated α-diimine nickel catalyst for ethylene polymerization: deactivation mechanism

Cited by 15 publications

References 34 publications

A continuing legend: the Brookhart-type α-diimine nickel and palladium catalysts

A continuing legend: the Brookhart-type α-diimine nickel and palladium catalysts

Single and binary catalyst systems based on nickel and palladium in polymerization of ethylene

Nickel and palladium complexes with fluorinated alkyl substituted α-diimine ligands for living/controlled olefin polymerization

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