Supported SiO2‐nBuSnCl3/MAO/(nBuCp)2ZrCl2 catalyzing MAO cocatalyst‐free ethylene polymerization: Study of hydrogen responsiveness

Atiqullah, Muhammad; Moman, A.; Akhtar, M. Naseem; Al‐Muallem, Hasan A.; Abu-Raqabah, A. H.; Ahmed, Neaz

doi:10.1002/app.26702

Cited by 10 publications

(18 citation statements)

References 28 publications

(25 reference statements)

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“…The polystyrene calibration curve was converted into the universal using the Mark–Houwink constants of polystyrene ( Κ = 0.000406 dL/g and α = 0.725). 44…”

Section: Methodsmentioning

confidence: 99%

Early Metal Di(pyridyl) Pyrrolide Complexes with Second Coordination Sphere Arene−π Interactions: Ligand Binding and Ethylene Polymerization

et al. 2019

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Early metal complexes supported by hemilabile, monoanionic di(pyridyl) pyrrolide ligands substituted with mesityl and anthracenyl groups were synthesized to probe the possibility of second coordination sphere arene−π interactions with ligands with potential for allosteric control in coordination chemistry, substrate activation, and olefin polymerization. Yttrium alkyl, indolide, and amide complexes were prepared and structurally characterized; close contacts between the anthracenyl substituents and Y-bound ligands are observed in the solid state. Titanium, zirconium, and hafnium tris(dimethylamido) complexes were synthesized, and their ethylene polymerization activity was tested. In the solid state structure of one of the Ti tris(dimethylamido) complexes, coordination of Ti to only one of the pyridine donors is observed pointing to the hemilabile character of the di(pyridyl) pyrrolide ligands.

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“…The polystyrene calibration curve was converted into the universal using the Mark–Houwink constants of polystyrene ( Κ = 0.000406 dL/g and α = 0.725). 44…”

Section: Methodsmentioning

confidence: 99%

Early Metal Di(pyridyl) Pyrrolide Complexes with Second Coordination Sphere Arene−π Interactions: Ligand Binding and Ethylene Polymerization

et al. 2019

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“…It consisted of a fixed top head and a one-liter jacketed Büchi glass autoclave. The reactor system is detailed in our earlier publications [7,8,22]. The reactor was baked for an hour at about 120°C.…”

Section: Elemental Compositions Of the Synthesized Catalystsmentioning

confidence: 99%

“…The metallocene catalyst [PQ 3030/MAO/( n BuCp) 2 ZrCl 2 ] was synthesized following the procedures detailed in our earlier publications [7,8,22]. The silica (PQ 3030) was dehydroxylated at 250°C for 4 h using a Thermcraft furnace equipped with a vertical quartz glass tube, a digital temperature indicator and controller, a gas flow meter, and a vacuum pump.…”

Section: Synthesis Of Catalystsmentioning

confidence: 99%

“…High purity nitrous oxide-acetylene flame was used for the analyses. The analysis procedures available in the literature were followed [7,8,22,25] Polymerization trials and catalyst activity Ethylene was polymerized using an Imtech laboratory-scale reactor set up. It consisted of a fixed top head and a one-liter jacketed Büchi glass autoclave.…”

Section: Elemental Compositions Of the Synthesized Catalystsmentioning

confidence: 99%

“…Here, the supported Ziegler-Natta, chrome, and metallocene catalysts are normally utilized. The solid catalyst disintegrates during polymerization, and mainly architects the polymer backbones with varying molecular chains/weights, and develops the desired particulate resin morphology [1][2][3][4][5][6][7][8]. The resulting resin contains the catalyst as residues.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization kinetics of ethylene homopolymers: a new perspective from residual catalyst and resin molecular weight

et al. 2012

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Two Ziegler-Natta and one metallocene supported catalysts were prepared that were used to synthesize ethylene homopolymers with different molecular weights. The influence of varying residual catalyst types and molecular weights on the isothermal crystallization kinetics of these polymers was studied using DSC and Avrami model to gain better understanding. The MetCat HomoPE, unlike the Z-N HomoPEs, followed the Avrami model during the entire crystallization. The increase in molecular weights did not affect (i) the decreasing trend of 1/t 1/2 (bulk crystallization rate) and K (crystallization rate constant) with the increase in T c (crystallization temperature), and (ii) the increasing trend of K with the increase in %crystallinity. However, combined with the varying residual catalysts, it differently varied the rate of change of 1/t 1/2 and K; and decreased T c . K and 1/t 1/2 turned out to be asymptotically related up to 1/t 1/2 ≈0.73 min −1 . The residual catalyst type more predominantly affected the crystallization facileness than the molecular weight. Therefore, the Z-N 1 residual catalyst acted as heterogeneous nuclei. In Z-N HomoPE 1 and Z-N HomoPE 2, n ranged from 2.2 to 3.4, and 2.6 to 3.0, respectively as a function of T c . In MetCat HomoPE, it remained constant at 2. Therefore, the MetCat residual catalyst impinged the expected spherulitic crystal growth to a two dimensional one. All these findings were explained considering how the molecular level residual catalysts, with their characteristic surface chemistries and structures, influenced the prevailing heterogeneous nucleation process, and the aliased interaction of G (nuclei growth rate) and Ñ (nucleation rate).

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Supported single‐site catalysts for slurry and gas‐phase olefin polymerisation

Choi

Soares

2011

Can J Chem Eng

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Early and late transition metal single‐site catalysts revolutionised the polyolefin manufacturing industry and research with their ability to make polymers with uniform microstructural properties. Several of these catalysts are currently used commercially to produce commodity and differentiated‐commodity resins. The key to their rapid success and industrial implementation resided in the fact that they could be used without major modifications in the polymerisation reactors that previously used heterogeneous Ziegler–Natta and Phillips catalysts. Since most of these industrial processes use slurry or gas‐phase reactors, the soluble single‐site catalysts must be supported on adequate carriers that ensure not only high activity, but also the formation of polymer particles with the proper morphology and bulk densities. In this article, we will review several methods used for supporting single‐site early and late transition metal catalysts on a variety of supports. © 2011 Canadian Society for Chemical Engineering

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Supported SiO₂‐ⁿBuSnCl₃/MAO/(ⁿBuCp)₂ZrCl₂ catalyzing MAO cocatalyst‐free ethylene polymerization: Study of hydrogen responsiveness

Cited by 10 publications

References 28 publications

Early Metal Di(pyridyl) Pyrrolide Complexes with Second Coordination Sphere Arene−π Interactions: Ligand Binding and Ethylene Polymerization

Early Metal Di(pyridyl) Pyrrolide Complexes with Second Coordination Sphere Arene−π Interactions: Ligand Binding and Ethylene Polymerization

Crystallization kinetics of ethylene homopolymers: a new perspective from residual catalyst and resin molecular weight

Supported single‐site catalysts for slurry and gas‐phase olefin polymerisation

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