Zirconium complexes based on an ethylene linked amidinate–amido ligand: synthesis, characterization and ethylene polymerization

2017 ◽  
Vol 41 (2) ◽  
pp. 661-670 ◽  
Author(s):  
Wei Li ◽  
Sheng-Di Bai ◽  
Feng Su ◽  
Shi-Fang Yuan ◽  
Xin-E Duan ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Molar Ratio ◽  
Zirconium Complexes ◽  
Ligand Synthesis

Monomer/dimer zirconium complexes 4–6 were synthesized by changing the molar ratio of ZrCl4 : ligand. The catalytic behaviors of these zirconium complexes were investigated in the presence of MAO as a cocatalys.

Reactivity of a new family of diamido-diamine cyclam-based zirconium complexes in ethylene polymerization

2010 ◽  
Vol 363 (8) ◽  
pp. 1823-1830 ◽  
Author(s):  
Luís G. Alves ◽  
Maria Augusta Antunes ◽  
Inês Matos ◽  
Rui F. Munhá ◽  
M. Teresa Duarte ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
New Family ◽  
Zirconium Complexes

scholarly journals Effects of Various Mixed Metal Chlorides- AlCl3 in TiCl4/MgCl2/THF Catalytic System on Ethylene Polymerization

2015 ◽  
Vol 14 (2) ◽  
pp. 12
Author(s):  
Nittaya Sudsong ◽  
Wanna Phiwkliang ◽  
Bunjerd Jongsomjit ◽  
Piyasan Praserthdam
Keyword(s):  
Catalytic System ◽  
Ethylene Polymerization ◽  
Catalyst System ◽  
Polymerization Reaction ◽  
Molar Ratio ◽  
Metal Chlorides ◽  
Mixed Metal ◽  
Icp Analysis ◽  
Co Addition

In this research, the modification of TiCl4/MgCl2/THF catalyst system with various metal chlorides was investigated on ethylene polymerization. Experimentally, metal chlorides (CaCl2, FeCl2 and ZnCl2) were simultaneously introduced different with TiCl4/MgCl2/THF catalyst. ICP analysis was used to determine the total amount of each metal in the catalyst. For polymerization reaction, TEA was used as cocatalyst and hexane was used as a medium solvent. The Al/Ti molar ratio was 140. The activity result of Ca-Al, Zn-Al and Fe-Al was 979, 1009 and 1476 kgPE/molTi.h, respectively. The coaddition of AlCl3 and FeCl2 in TiCl4/MgCl2/THF catalyst system exhibited the highest activity. It suggested that the co-addition of AlCl3 and FeCl2 has higher electronegativity (EN) and the radius of Fe2+ is closer to Mg2+ resulting in an increased efficiency of the THF removal. This result led to improve the catalyst performance.

Titanium and zirconium complexes containing the new 2,3-dimethyl-1,4-diphenylcyclopentadienyl ligand. Synthesis, characterization and polymerization behavior

2004 ◽  
Vol 689 (9) ◽  
pp. 1623-1630 ◽  
Author(s):  
Jiřı́ Pinkas ◽  
Michal Horáček ◽  
Jiřı́ Kubišta ◽  
Róbert Gyepes ◽  
Ivana Cı́sařová ◽  
...  
Keyword(s):  
Zirconium Complexes ◽  
Polymerization Behavior ◽  
Ligand Synthesis

Manganese(II) halogeno complexes with neutral tris(3,5-diisopropyl-1-pyrazolyl)methane ligand: Synthesis and ethylene polymerization

2007 ◽  
Vol 269 (1-2) ◽  
pp. 163-168 ◽  
Author(s):  
Masaaki Nabika ◽  
Seiki Kiuchi ◽  
Tatsuya Miyatake ◽  
Ken-Ichi Okamoto ◽  
Kiyoshi Fujisawa
Keyword(s):  
Ethylene Polymerization ◽  
Ligand Synthesis

Ethylene polymerization activity under practical conditions displayed by zirconium complexes having two phenoxy-imine chelate ligands

2001 ◽  
Vol 169 (1-2) ◽  
pp. 99-104 ◽  
Author(s):  
Naoto Matsukawa ◽  
Shigekazu Matsui ◽  
Makoto Mitani ◽  
Junji Saito ◽  
Kazutaka Tsuru ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Zirconium Complexes ◽  
Chelate Ligands

Ethylene Polymerization by Thioether Bridged Dinuclear Titanocene Complex

2011 ◽  
Vol 213 ◽  
pp. 354-357 ◽  
Author(s):  
Yu Jing Nie ◽  
Ming Yang
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
Ethylene Polymerization ◽  
Gel Permeation Chromatography ◽  
Molar Ratio ◽  
Polymerization Temperature ◽  
High Concentration ◽  
Highly Active ◽  
Cyclopentadienyl Ligand ◽  
Broad Molecular Weight Distribution

The thioether bridged metallocene complex [(C5H5)Cl2TiC5H4CH2CH2]2S has been synthesized by treating the dilithium salts of the thioether bridged cyclopentadienyl ligand with two equivalents of C5H5TiCl3 and characterized by 1HMNR and elemental analysis. After activation with methylaluminoxane (MAO), the complex was highly active catalysts for homogeneous ethylene polymerization in toluene. The influence of the molar ratio [MAO]/[Cat], the catalyst concentration, time and temperature have been studied systematically. The catalytic activity of 1 is 3.63×105 g PE/mol•Cat•h. Rising the polymerization temperature decreases the catalytic activity for 1. A high concentration of the catalysts drops the catalytic activity as well as the molecular weight of polyethylene for the complex. High temperature gel permeation chromatography (HT-GPC) proves the production of polyethylene with a broad molecular weight distribution (MWD).

Synthesis, Characterization, and Activity in Ethylene Polymerization of Silica Supported Cationic Cyclopentadienyl Zirconium Complexes

2006 ◽  
Vol 128 (29) ◽  
pp. 9361-9370 ◽  
Author(s):  
Nicolas Millot ◽  
Sophie Soignier ◽  
Catherine C. Santini ◽  
Anne Baudouin ◽  
Jean-Marie Basset
Keyword(s):  
Ethylene Polymerization ◽  
Zirconium Complexes
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