Substantially enhancing the catalytic performance of bis (imino)pyridylcobaltous chloride pre‐catalysts adorned with benzhydryl and nitro groups for ethylene polymerization

2019 ◽  
Vol 33 (7) ◽  
Author(s):  
Qaiser Mahmood ◽  
Yanping Ma ◽  
Xiang Hao ◽  
Wen‐Hua Sun
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance

Doubly fused N,N,N-Iron Ethylene Polymerization Catalysts appended with Fluoride Substituents; probing catalytic performance via a combined experimental and MLR study

2021 ◽  
Author(s):  
Qiuyue Zhang ◽  
Wenhong Yang ◽  
Zheng Wang ◽  
Gregory A. Solan ◽  
Tongling Liang ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Chloride Complex ◽  
Polymerization Catalysts

Access to six examples of α,α’-bis(imino)-2,3:5,6-bis(pentamethylene)pyridine-iron(II) chloride complex, [2,3:5,6-{C4H8C(N(2-R1-4-R3-6-R2C6H2)}2C5HN] (R1 = Me, R2 = R3 = CH(p-FPh)2 Fe1; R1 = Et, R2 = R3 = CH(p-FPh)2 Fe2; R1 = iPr,...

Active O,Npy,N-Titanium(IV) Fluoride Precatalysts for Ethylene Polymerization: Exploring “Fluoride Effects” on Polymer Properties and Catalytic Performance

2016 ◽  
Vol 35 (9) ◽  
pp. 1183-1191 ◽  
Author(s):  
Luka A. Wright ◽  
Eric G. Hope ◽  
Gregory A. Solan ◽  
Warren B. Cross ◽  
Kuldip Singh
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Polymer Properties

Bis-cycloheptyl-fused bis(imino)pyridine-cobalt catalysts for PE wax formation: positive effects of fluoride substitution on catalytic performance and thermal stability

2020 ◽  
Vol 49 (27) ◽  
pp. 9425-9437 ◽  
Author(s):  
Qiuyue Zhang ◽  
Ningning Wu ◽  
Junfeng Xiang ◽  
Gregory A. Solan ◽  
Hongyi Suo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Cobalt Catalysts ◽  
Low Molecular Weight ◽  
Polymerization Catalysts ◽  
Positive Effects

The depicted ethylene polymerization catalysts exhibited optimal activities at 60 °C forming low molecular weight PE waxes; ortho-F substitution proved beneficial.

Ethylene polymerization by the thermally unique 1-[2-(bis(4-fluoro phenyl)methyl)-4,6-dimethylphenylimino]-2-aryliminoacenaphthylnickel precursors

2015 ◽  
Vol 44 (27) ◽  
pp. 12282-12291 ◽  
Author(s):  
Shizhen Du ◽  
Qifeng Xing ◽  
Zygmunt Flisak ◽  
Erlin Yue ◽  
Yang Sun ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance

Finely tuned substituents within ligands control the catalytic performance of the corresponding complex precursors, tailoring resulting polyethylenes.

scholarly journals Bis(η5-cyclopentadienyl)bistriphenylsilanolatozirconium( IV): a new precursor for ethylene polymerization catalysis

e-Polymers ◽  
2001 ◽  
Vol 1 (1) ◽  
Author(s):  
Angelina Altomare ◽  
Roberta Candian ◽  
Marco Michelotti ◽  
Guido Pampaloni ◽  
Francesco Ciardelli
Keyword(s):  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Ligand Substitution ◽  
Polymerization Catalysis ◽  
Comparable Activity

AbstractTrialkylsilanols were reported to modify and also to improve the catalytic performance in ethylene polymerization when added to zirconocene/methylaluminoxane (MAO) systems. In order to obtain more information about the chemistry involved, a new stable catalytic precursor was investigated in this work. The precursor bis(h5-cyclopentadienyl)bistriphenylsilanolatozirconium(IV) [ZrCp2(OSiPh3)2] was compared to ZrCp2(CH3)2 and ZrCp4, which can generate ZrCp2(OSiPh3)2 in situ on triphenylsilanol addition. In ethylene polymerization, ZrCp2(OSiPh3)2 exibits a comparable activity and a larger stability than dicyclopentadienylzirconium complexes. On addition of triphenylsilanol to zirconocenes, the productivity increased and the molecular weight sharply decreased, thus suggesting the occurrence of ligand substitution in solution. The reported results are discussed with reference to the proposed mechanism of ethylene polymerization with the conventional ZrCp2Cl2/MAO system.

Catalytic performance of bis(imino)pyridine Fe/Co complexes toward ethylene polymerization by 2D‐/3D‐QSPR modeling

2019 ◽  
Vol 40 (13) ◽  
pp. 1374-1386 ◽  
Author(s):  
Wenhong Yang ◽  
Zhifeng Ma ◽  
Jun Yi ◽  
Sadia Ahmed ◽  
Wen‐Hua Sun
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Qspr Modeling

Novel titanium complexes bearing two chelating phenoxy-imine ligands and their catalytic performance for ethylene polymerization

2007 ◽  
Vol 21 (4) ◽  
pp. 268-274 ◽  
Author(s):  
Junquan Sun ◽  
Zhengzai Cheng ◽  
Yujing Nie ◽  
H. Schumann ◽  
M. Hummert
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Titanium Complexes ◽  
Imine Ligands

Prepare of Novel Zirconium Complex and Catalytic Performance for Ethylene Polymerization

2011 ◽  
Vol 179-180 ◽  
pp. 1091-1095 ◽  
Author(s):  
Zheng Zai Cheng ◽  
Yu Jing Nie ◽  
Xiao Chao Yan ◽  
Rui Lei ◽  
Su Su Lin
Keyword(s):  
Molecular Weight ◽  
Reaction Temperature ◽  
Ethylene Polymerization ◽  
Average Molecular Weight ◽  
Catalytic Performance ◽  
Zirconium Complex ◽  
Melting Points ◽  
Ligand Complex ◽  
Dichloromethane Solution ◽  
Very High

Novel zirconium complex 2 has been prepared by treatment of the ligand complex 1 with ZrCl4•2THF in dichloromethane solution. The complex 1 and 2 were characterized by 1H-NMR and IR. Activated by MAO, Complex 2 displays very high activity for ethylene polymerization under the reaction temperature of 40～80 °C and the viscosity-average molecular weight of polyethylene is more than 3.0×104 when reaction temperature is no more than 60°C.The molecular-weight distribution measured by gel permeation reached 2.50.High melting points measured by DSC indicates that the polyethylene produced by complex 2 is high linearity and high crystallinity.

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