13C NMR Determination of the Composition of Linear Low-Density Polyethylene Obtained with [η3-Methallyl-nickel-diimine]PF6 Complex

Galland, Griselda B.; Souza, Roberto Fernando de; Mauler, Raquel Santos; Nunes, Fernanda Freire Campos

doi:10.1021/ma981669h

Cited by 401 publications

(339 citation statements)

References 16 publications

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“…5). [20,30]. Some peaks, respectively, 33.4 ppm (CH 2 ), 27.6 ppm (CH 2 ), 26.7 ppm (CH 2 ), 20.4 ppm (CH 2 ) and 18.9 ppm (CH 3 ) from the 13 C NMR spectrum could not be assigned to the short side chain usually found in the structure of a classical polyethylene.…”

Section: Trimerisation Versus Polymerisation Activitymentioning

confidence: 86%

“…Some peaks, respectively, 33.4 ppm (CH 2 ), 27.6 ppm (CH 2 ), 26.7 ppm (CH 2 ), 20.4 ppm (CH 2 ) and 18.9 ppm (CH 3 ) from the 13 C NMR spectrum could not be assigned to the short side chain usually found in the structure of a classical polyethylene. However, this solid product contains short branches grafted on a (CH 2 ) n linear structure as indicated by the NMR peak at 27.3 ppm assigned to butyl chains [20,30,31], its spectrum does not correspond to a classical polyethylene structure. Long chain branches, respectively branches longer than hexyl chains, are related to the chemical shifts at 32.16, 29.6 and 38.24 ppm [30,[32][33][34].…”

Section: Trimerisation Versus Polymerisation Activitymentioning

confidence: 95%

“…Ni-based diimine catalyst can produce polyethylene with shortchain branches through a chain-walking mechanism [5,[19][20][21][22][23][24]. In 1997, Sumitomo Chemical Company has patented a process of ethylene trimerisation that uses this class of ligands.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Turning a Cr-based heterogeneous ethylene polymerisation catalyst into a selective ethylene trimerisation catalyst

Nenu

Bodart

Weckhuysen

2007

Journal of Molecular Catalysis A: Chemical

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A Phillips Cr/SiO 2 polymerisation catalyst was converted into an ethylene trimerisation catalyst after assembling new active sites on the silica surface in the presence of TAC (1,3,5-triphenylhexahydro 1,3,5-triazacyclohexane) as ligand and CH 2 Cl 2 as solvent. The reaction conditions play a role in tuning the catalytic activity of this system. It is a true trimerisation catalyst at low ethylene pressures, while, at high pressures, the polymerisation activity becomes dominant. Moreover, at high ethylene pressures, polyethylene characterised by a high crystallinity degree is obtained. Instead, a highly branched heavy oligomer of ethylene characterised by a very narrow molecular weight distribution is obtained at 1 bar. 1-Hexene, formed as the main product in the ethylene trimerisation reaction at low pressures, is partially incorporated into this growing oligomer making redundant the use of a second comonomer feedstock and an expensive catalyst.

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Section: Trimerisation Versus Polymerisation Activitymentioning

confidence: 86%

Section: Trimerisation Versus Polymerisation Activitymentioning

confidence: 95%

See 1 more Smart Citation

Turning a Cr-based heterogeneous ethylene polymerisation catalyst into a selective ethylene trimerisation catalyst

Nenu

Bodart

Weckhuysen

2007

Journal of Molecular Catalysis A: Chemical

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“…Almost all the peaks in Figure 1 have been assigned according to reported nomenclature [49,50], and tabulated in Table 2. The peaks that were not assigned have been marked with asterisk.…”

Section: Characterization Of Poly(1-hexene) Using 13 C{ 1 H} Nmr Specmentioning

confidence: 99%

Homo-Polymerization of 1-Hexene Catalysed by O^N^N (Salicylaldimine)Iron(III) Pre-Catalysts to Branched Poly(1-hexene)

2016

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“…Assign polymer branching according to the literature. [26][27][28] Note: An Agilent/Varian 600 MHz spectrometer at 130 °C was used for 13 C NMR analysis.…”

Section: Catalytic Polymerizations Using a Parallel Pressure Reactormentioning

confidence: 99%

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Hue

Tonks

2015

JoVE

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We demonstrate a method for high-throughput catalyst screening using a parallel pressure reactor starting from the initial synthesis of a nickel α-diimine ethylene polymerization catalyst. Initial polymerizations with the catalyst lead to optimized reaction conditions, including catalyst concentration, ethylene pressure and reaction time. Using gas-uptake data for these reactions, a procedure to calculate the initial rate of propagation (k p ) is presented. Using the optimized conditions, the ability of the nickel α-diimine polymerization catalyst to undergo chain transfer with diethylzinc (ZnEt 2 ) during ethylene polymerization was investigated. A procedure to assess the ability of the catalyst to undergo chain transfer (from molecular weight and 13 C NMR data), calculate the degree of chain transfer, and calculate chain transfer rates (k e ) is presented. Video LinkThe video component of this article can be found at

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¹³C NMR Determination of the Composition of Linear Low-Density Polyethylene Obtained with [η³-Methallyl-nickel-diimine]PF₆ Complex

Cited by 401 publications

References 16 publications

Turning a Cr-based heterogeneous ethylene polymerisation catalyst into a selective ethylene trimerisation catalyst

Turning a Cr-based heterogeneous ethylene polymerisation catalyst into a selective ethylene trimerisation catalyst

Homo-Polymerization of 1-Hexene Catalysed by O^N^N (Salicylaldimine)Iron(III) Pre-Catalysts to Branched Poly(1-hexene)

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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