scholarly journals Ferrous and Cobaltous Chlorides Bearing 2,8-Bis(imino)quinolines: Highly Active Catalysts for Ethylene Polymerization at High Temperature

2010 ◽  
Vol 29 (24) ◽  
pp. 6837-6840 ◽  
Author(s):  
Shu Zhang ◽  
Wen-Hua Sun ◽  
Tianpengfei Xiao ◽  
Xiang Hao
Keyword(s):  
High Temperature ◽  
Ethylene Polymerization ◽  
Highly Active

Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization

2018 ◽  
Vol 47 (38) ◽  
pp. 13459-13465 ◽  
Author(s):  
Quande Zheng ◽  
Dejuan Zheng ◽  
Binghao Han ◽  
Shaofeng Liu ◽  
Zhibo Li
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Chromium Complexes ◽  
Highly Active ◽  
Imine Ligands

Chromium complexes bearing phosphine–imine ligands are highly active for ethylene polymerization and produce HDPE with a high molecular weight.

Preparation of highly active Cr-catalysts for ethylene polymerization

Polymer ◽  
1985 ◽  
Vol 26 (12) ◽  
pp. 1891-1894 ◽  
Author(s):  
Kazuo Soga ◽  
Shian-Ing Chen ◽  
Takeshi Shiono ◽  
Yoshiharu Doi
Keyword(s):  
Ethylene Polymerization ◽  
Highly Active

scholarly journals High Temperature Vacuum Annealing and Hydrogenation Modification of Exfoliated Graphite Nanoplatelets

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaobing Li ◽  
Sanjib Biswas ◽  
Lawrence T. Drzal
Keyword(s):  
High Temperature ◽  
Functional Groups ◽  
Vacuum Annealing ◽  
Atmospheric Oxygen ◽  
Graphite Nanoplatelets ◽  
Highly Active ◽  
Oxygen Functional Groups ◽  
Defect Sites ◽  
Capacitance Characteristics ◽  
Oxygen Groups

Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.

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).

scholarly journals Vanadyl complexes bearing bi-dentate phenoxyimine ligands: synthesis, structural studies and ethylene polymerization capability

2014 ◽  
Vol 43 (22) ◽  
pp. 8300-8310 ◽  
Author(s):  
Jing Ma ◽  
Ke-Qing Zhao ◽  
Mark J. Walton ◽  
Joseph A. Wright ◽  
Josef W. A. Frese ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Structural Studies ◽  
Polymerization Catalysts ◽  
Highly Active ◽  
Vanadyl Complexes

Mono- and bi-vanadium bidentate phenoxyimine complexes have been structurally characterized. They are highly active ethylene polymerization catalysts in the presence of diethylaluminum chloride and ethyltrichloroacetate.

Bis(pyrazolyl)pyridine vanadium(III) complexes as highly active ethylene polymerization catalysts

2007 ◽  
Vol 692 (24) ◽  
pp. 5327-5330 ◽  
Author(s):  
Hanna S. Abbo ◽  
Selwyn F. Mapolie ◽  
James Darkwa ◽  
Salam J.J. Titinchi
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Catalysts ◽  
Highly Active
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