| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Repo, Timo
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Mesoporous silica-amine beads from blast furnace slag for CO<sub>2</sub> capture applicationscitations
- 2023Functionalization of nitrogen-doped graphene quantum dotcitations
- 2022Parahydrogen-induced polarization study of imine hydrogenations mediated by a metal-free catalystcitations
- 2017Nuclear spin hyperpolarization with ansa-aminoboranes : a metal-free perspective for parahydrogen-induced polarizationcitations
- 2016Nuclear spin hyperpolarization with ansa-aminoboranescitations
- 2016Towards improved solubility of poorly water-soluble drugscitations
- 2014Tweezers for Parahydrogencitations
- 2011Two- and three-dimensional packing diagrams of M(salophen) complexescitations
- 2006Synthesis of titanium complexes bearing two mono anionic malonic acid ester based ligands and their use as catalyst precursors in ethene polymerizationcitations
- 2006High-molar-mass polypropene with tunable elastic properties by hafnocene/borate catalystscitations
- 2004Tetrakis Sn(IV) alkoxides as novel initiators for living ring-opening polymerization of lactidescitations
- 2002New bis(imino)pyridine-iron(II)- and cobalt(II)-based catalysts: synthesis characterization and activity towards polymerization of ethylenecitations
- 2002Copolymerization of propene with phenylnorbornene using ansa-bridged metallocene catalystscitations
- 2001Copolymerization of carbon monoxide with exo-methylenecycloalkane and dienes: synthesis of functionalized aliphatic polyketonescitations
- 2000Synthesis and crystal structure of [1-(eta(5)-9-fluorenyl)-2-(eta(5)-1-indenyl)ethane]-hafnium dimethyl
Places of action
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article
Copolymerization of propene with phenylnorbornene using ansa-bridged metallocene catalysts
Abstract
Propene was copolymerized with phenylnorbornene using methylaluminumoxane (MAO)-activated metallocene dichlorides exhibiting different symmetry: C-2-Symmetric rac-ethylenebis(I-indenyl)zirconium dichloride (1), rac-dimethylsilylbis(l-indenyl)zirconium dichloride (2), rae-ethylenebis(I-indenyl)hafnium dichloride (6), C-s-symmetric isopropylidene(cyclopentadienyl-9-fluorenyl)zirconium dichloride (3), meso-ethylenebis(l-indenyl)zirconium dichloride (4), and C-1-symmetric ethylene(1-fluorenyl-1-phenyl-2-indenyl)zirconium dichloride (5) were chosen to evaluate the influence of the symmetry in copolymerization reactions. Experiments were done as batch polymerizations to produce homogeneous copolymers. By this setup, blend formation was avoided. The copolymers were characterized by NMR, GPC, and DSC. Catalysts I and 2 were the most active to copolymerize random, amorphous, copolymers with good activity. C-s-symmetric, 3, showed decreased activity compared with 1 and 2 and produced a bimodal copolymer. Catalyst 4 showed even lower activity than that of 3. The activity of the hafnium complex 6, which produced a semicrystalline polymer with a high molecular weight (116,000 g/mol) was 320 kg/mol. Catalyst I produced the highest comonomer content (42%) in the copolymers measured by NMR. The least active catalyst was 5 (phenyl croup in the bridge), producing only 290 kg copolymer per mole of catalyst. All polymers had elevated glass transition temperatures compared to polypropylene