Ethylene polymerization using nickel α-diimine complex supported on SiO2/MgCl2 bisupport

Xue, Xinghua; Yang, Xuan; Xiao, Yi-Zhi; Zhang, Qixing; Wang, Haihua

doi:10.1016/j.polymer.2004.02.048

Cited by 18 publications

(6 citation statements)

References 10 publications

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“…DEAC is also presumed to react with supported nickel α-diimine complex in the presence of ethylene to form similar catalytical cationic active species while TEA and TIBA probably make the complex of NiLBr 2 reduce excessively and cannot form the cationic species. In our previous study, for α-diimine-based late transition metal catalyst, a similar result was reported [16,18].…”

Section: Effects Of the Cocatalystsupporting

confidence: 81%

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Polymerization of ethylene using a nickel α-diimine complex covalently supported SiO2-MgCl2 bisupport

Jiang

Xiao

2011

E-Polymers

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Bisupported catalyst for ethylene polymerization was prepared by mixing alcohol solution of MgCl 2 with pretreated SiO 2 in heptane, the prepared bisupport was modified by treatment with alkyl aluminum compounds, and further treatment with bis(4-(4-amine-3,5-diisopropylbenzyl)-2,6-diisopropylphenylimino) acenaphthene NiBr 2 (abbreviaed as NiLBr 2 ) solution. The most significant feature of the supported catalyst is that it polymerizes ethylene with high activities in the presence of inexpensive general alkylaluminum compounds. According to the results of high temperature GPC, the number-average molecular weights of the polymers ranged from 2.15×10 5 to 9.27×10 5 and the polydispersities ranged from 3.12 to 4.23. By modulating the polymerization temperatures, the products of different and good morphologies were obtained. The resultant PE was confirmed by 13 C NMR to contain significant amounts of not only methyl but also ethyl, propyl, butyl,amyl, and long branches (longer than six carbons).

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Section: Effects Of the Cocatalystsupporting

confidence: 81%

“…The discussion subjects include the molecular weight, degree of branching, and branch type. In our previous papers, the activity and product character of unsupported, the modified MgCl 2 and the modified silica supported NiLBr 2 for ethylene polymerization has been discussed [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Polymerization of ethylene using a nickel α-diimine complex covalently supported SiO2-MgCl2 bisupport

Jiang

Xiao

2011

E-Polymers

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“…4b. The enhancement in the activity at a higher Al/Ni molar ratio could be associated with greater opportunity for reducing nickel-diimine complexes to form cationic, catalytically active species [19]. However, further increase in the Al/Ni molar ratio may speed up the chain transfer on AlEt 2 Cl and thus result in the decrease of the catalytic activity, as shown in our previous work [16] in which same nickel a-diimine catalyst (NiLBr 2 ) supported on the AlEt 3 -activated organoclay was used to initiate the ethylene polymerization and to provide the reinforcement materials after the polymerization.…”

Section: Resultsmentioning

confidence: 99%

Organo-modified ZnAl layered double hydroxide as new catalyst support for the ethylene polymerization

Zhang

2007

Journal of Colloid and Interface Science

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“…In addition to the basic study, many of the supported catalysts based on these α ‐diimine complexes were actively investigated due to their practical use. 5–23 As an ordinary method, the impregnation of the metal complexes onto MAO‐treated SiO 2 was attempted for the preparation of the supported catalysts. These catalysts well controlled the morphology of the polyethylene particles and showed a high activity for the polymerization of ethylene 5.…”

Section: Introductionmentioning

confidence: 99%

Copolymerization of Ethylene with Vinyl Monomers using Heterogeneous Catalysts Consisting of α‐Diimine Ni(II) Complexes Immobilized into a Fluorotetrasilicic Mica Interlayer in the Presence of an Alkylaluminum Compound

Kurokawa

Nakazato

Tahara

et al. 2012

Macro Reaction Engineering

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α‐Diimine nickel complexes immobilized into fluorotetrasilicic mica interlayers are prepared by the reaction of an α‐diimine ligand and nickel‐ion‐exchanged fluorotetrasilicic mica, and these are used for the copolymerization of ethylene with linear α‐olefins (1‐hexene, 1‐octene, and 1‐decene), cyclic olefins (norbornene and cyclopentene), or polar vinyl monomers (methyl acrylate and 5‐hexenenitrile). The copolymerization of ethylene with α‐olefins affords linear low‐density polyethylene including methyl and alkyl branches. The incorporation of cyclopentene into the main chain is proved by the 13C NMR spectrum of the ethylene/cyclopentene copolymer. No significant activity is observed during the copolymerization of ethylene with norbornene, methyl acrylate, or 5‐hexenenitrile.

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Ethylene polymerization using nickel α-diimine complex supported on SiO2/MgCl2 bisupport

Cited by 18 publications

References 10 publications

Polymerization of ethylene using a nickel α-diimine complex covalently supported SiO2-MgCl2 bisupport

Polymerization of ethylene using a nickel α-diimine complex covalently supported SiO2-MgCl2 bisupport

Organo-modified ZnAl layered double hydroxide as new catalyst support for the ethylene polymerization

Copolymerization of Ethylene with Vinyl Monomers using Heterogeneous Catalysts Consisting of α‐Diimine Ni(II) Complexes Immobilized into a Fluorotetrasilicic Mica Interlayer in the Presence of an Alkylaluminum Compound

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