scholarly journals Group 4 permethylindenyl complexes for slurry-phase polymerisation of ethylene

2019 ◽  
Vol 10 (11) ◽  
pp. 1386-1398 ◽  
Author(s):  
Jessica V. Lamb ◽  
Jean-Charles Buffet ◽  
Zoë R. Turner ◽  
Dermot O'Hare
Keyword(s):  
Molecular Weights ◽  
Group 4 ◽  
Slurry Phase ◽  
Ethylene Polymerisation

Supported group 4 permethylindenyl based catalysts displayed extremely high ethylene polymerisation activity affording popcorn shaped low molecular weights polyethylenes.

Group 4 permethylindenyl constrained geometry complexes for ethylene polymerisation catalysis

2018 ◽  
Vol 8 (21) ◽  
pp. 5454-5461 ◽  
Author(s):  
Thomas J. Williams ◽  
Jean-Charles Buffet ◽  
Zoë R. Turner ◽  
Dermot O'Hare
Keyword(s):  
Group 4 ◽  
Constrained Geometry ◽  
Slurry Phase ◽  
Ethylene Polymerisation

The synthesis and characterisation of six permethylindenyl constrained geometry complexes is reported. Slurry phase ethylene polymerisation studies demonstrate that activities increase with increasing electron donating character of the amido fragment.

Synthesis and characterisation of permethylindenyl zirconium complexes and their use in ethylene polymerisation

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87456-87464 ◽  
Author(s):  
Jean-Charles Buffet ◽  
Thomas A. Q. Arnold ◽  
Zoë R. Turner ◽  
Phakpoom Angpanitcharoen ◽  
Dermot O'Hare
Keyword(s):  
Group 4 ◽  
Zirconium Complexes ◽  
Slurry Phase ◽  
Ethylene Polymerisation

We report here the synthesis, characterisation and use in solution and slurry phase ethylene polymerisation of new group 4 permethylindenyl complexes.

scholarly journals Slurry-phase ethylene polymerisation using group 4 ansa-bridged permethylindenyl complexes supported on polymethylaluminoxane

2020 ◽  
Vol 484 ◽  
pp. 110735 ◽  
Author(s):  
Jessica V. Lamb ◽  
Joseph C. Abell ◽  
Jack E. McLaren ◽  
Jean-Charles Buffet ◽  
Zoë R. Turner ◽  
...  
Keyword(s):  
Group 4 ◽  
Slurry Phase ◽  
Ethylene Polymerisation

Supported bis(peralkylindenyl)metallocene catalysts for slurry phase ethylene polymerisation

Polyhedron ◽  
2016 ◽  
Vol 116 ◽  
pp. 216-222 ◽  
Author(s):  
Phakpoom Angpanitcharoen ◽  
George Hay ◽  
Jean-Charles Buffet ◽  
Zoë R. Turner ◽  
Thomas A.Q. Arnold ◽  
...  
Keyword(s):  
Metallocene Catalysts ◽  
Slurry Phase ◽  
Ethylene Polymerisation

scholarly journals Synthesis, APPI Mass-Spectrometric Characterization and Polymerization Studies of Group 4 Dinuclear Bis(ansa-metallocene) Complexes

2018 ◽  
Author(s):  
Gilles Schnee ◽  
Mathilde Farenc ◽  
Leslie Bitard ◽  
Aurelien Vantomme ◽  
Alexandre Welle ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Mass Spectrometric ◽  
Spectrometric Data ◽  
Molecular Weights ◽  
Group 4 ◽  
Dinuclear Compounds ◽  
First Time ◽  
Metallocene Complexes ◽  
Catalytic Performances

New ligand platforms of the type p- or m-Ph{-CR(3,6-tBu2Flu)(Cp)}2 (para-, R = Me (2a), H (2b); meta-, R = Me (2c)) were synthesized via nucleophilic addition of the 3,6-tBu2-fluorenyl-anion onto the parent phenylene-bridged difulvenes (1a‒c). The corresponding discrete homodinuclear zirconium and hafnium bis(dichloro ansa-metallocene) complexes, Ph[{-CR(3,6-tBu2Flu)(Cp)}MCl2]2 (p-, R = Me (3a-Zr2, 3a-Hf2), R = H (3b-Zr2); m-, R = Me (3c-Zr2) were prepared by salt metathesis reactions. An attempt to generate in situ a heterodinuclear complex 3a-Zr-Hf was also undertaken. For the first time, Atmospheric Pressure PhotoIonization (APPI) mass-spectrometric data were obtained for all dinuclear compounds and found to be in excellent agreement with the simulated ones. Preliminary studies on the catalytic performances of these dinuclear complexes, upon activation with MAO, in ethylene homopolymerization and ethylene/1-hexene copolymerization revealed a few differences as compared to those of the monometallic analogues. In particular, slightly lower molecular weights and greater formation of short methyl and ethyl branches were obtained with the dinuclear systems.

The Effect of Alternative Solvents on the Biocompatibility of Centrifugally Spun Poly-ε-Caprolactone

2020 ◽  
Vol 834 ◽  
pp. 155-161
Author(s):  
Vera Lukášová ◽  
Matej Buzgo ◽  
Evzen Amler ◽  
Eva Filová ◽  
Michala Rampichová
Keyword(s):  
Tissue Engineering ◽  
Cell Adhesion ◽  
Three Dimensional ◽  
Osteosarcoma Cell ◽  
Molecular Weights ◽  
Group 4 ◽  
Promote Cell Migration ◽  
Centrifugal Spinning ◽  
Electrospinning Method

Suitable scaffolds for tissue engineering should promote several features that enable regeneration of the damaged tissue in vivo. In general, nanoto microfibrous meshes resemble extracellular matrix and support cell adhesion; three dimensional scaffolds, together with interconnected pores, promote cell migration into the volume of the scaffolds. Furthermore, the scaffold should be biodegradable with no harmful byproducts and easy to produce. Centrifugal spinning is an alternative method, to widely used electrospinning method, to produce 3D scaffolds suitable for use in tissue engineering. In this study, we tested different molecular weights and solvent systems of poly-ε-caprolactone (PCL) that were produced by the centrifugal spinning method. The produced scaffolds were characterized and seeded with Saos2 osteosarcoma cell line to verify their biocompatibility. We concluded from the results that group 4 scaffold, produced from a mixture of two molecular weights of PCL dissolved in acetic acid/formic acid, supported cell adhesion, proliferation and metabolic activity the most out of all the tested scaffolds. The other PCL scaffolds were prepared either from one type of molecular weight of PCL or chloroform was solely used to produce the scaffolds.

scholarly journals Metallocene supported core@LDH catalysts for slurry phase ethylene polymerisation

2016 ◽  
Vol 52 (21) ◽  
pp. 4076-4079 ◽  
Author(s):  
Jean-Charles Buffet ◽  
Coral F. H. Byles ◽  
Ryan Felton ◽  
Chunping Chen ◽  
Dermot O'Hare
Keyword(s):  
Single Phase ◽  
Synergistic Effects ◽  
Hybrid Catalysts ◽  
Slurry Phase ◽  
Ethylene Polymerisation

Immobilisation of rac-(EBI)ZrCl2 on the hybrid catalysts, core@AMO-LDH, demonstrate synergistic effects in which the polymerisation activity is up to three times higher than rac-(EBI)ZrCl2 supported on analogous single phase supports.

Ethylene polymerisation using solid catalysts based on layered double hydroxides

2015 ◽  
Vol 6 (13) ◽  
pp. 2493-2503 ◽  
Author(s):  
Jean-Charles Buffet ◽  
Zoë R. Turner ◽  
Robert T. Cooper ◽  
Dermot O'Hare
Keyword(s):  
Organic Solvent ◽  
Metal Complexes ◽  
Support System ◽  
Layered Double Hydroxides ◽  
Catalyst Support ◽  
Solid Catalysts ◽  
Slurry Phase ◽  
Double Hydroxide ◽  
Ethylene Polymerisation ◽  
Double Hydroxides

We report here the use of methylaluminoxane (MAO) modified aqueous miscible organic solvent treated (AMOST) layered double hydroxide, Mg6Al2(OH)16CO3·4H2O (AMO-Mg3Al-CO3) as a catalyst support system for the slurry phase polymerisation of ethylene using immobilised metallocene and non-metallocene metal complexes.

scholarly journals Synthesis, characterisation and slurry phase ethylene polymerisation of rac-(PhBBI*)ZrCl2 immobilised on modified layered double hydroxides

2019 ◽  
Vol 468 ◽  
pp. 139-147 ◽  
Author(s):  
Grace E. Hickman ◽  
Christopher M.R. Wright ◽  
Alexander F.R. Kilpatrick ◽  
Zoë R. Turner ◽  
Jean-Charles Buffet ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Slurry Phase ◽  
Ethylene Polymerisation ◽  
Double Hydroxides

scholarly journals Polymethylaluminoxane organic frameworks (sMAOF) – highly active supports for slurry phase ethylene polymerisation

2021 ◽  
Author(s):  
Alexander F. R. Kilpatrick ◽  
Harry S. Geddes ◽  
Zoë R. Turner ◽  
Jean-Charles Buffet ◽  
Andrew L. Goodwin ◽  
...  
Keyword(s):  
Catalyst Supports ◽  
Highly Active ◽  
Slurry Phase ◽  
Ethylene Polymerisation

A series of modified solid polymethylaluminoxane (sMAO) catalyst supports have been developed for slurry phase ethylene polymerisation, using aryl di-ol modifier groups.

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