Introducing electron-donating substituents on ligand backbone of α-diimine nickel complex and the effects on catalyst thermal stability in ethylene polymerization

2019 ◽  
Vol 486 ◽  
pp. 704-710 ◽  
Author(s):  
Feng He ◽  
Dan Wang ◽  
Baiyu Jiang ◽  
Zhen Zhang ◽  
Zhenmei Cheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ethylene Polymerization ◽  
Nickel Complex

Insight into the Mechanism of Thermal Stability of α-Diimine Nickel Complex in Catalyzing Ethylene Polymerization

2017 ◽  
Vol 36 (6) ◽  
pp. 1196-1203 ◽  
Author(s):  
Liang Zhu ◽  
Dandan Zang ◽  
Yi Wang ◽  
Yintian Guo ◽  
Baiyu Jiang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ethylene Polymerization ◽  
Nickel Complex ◽  
Thermal Stability Of ◽  
Insight Into

Remote dibenzocycloheptyl substitution on a bis(arylimino)pyridyl-iron ethylene polymerization catalyst; enhanced thermal stability and unexpected effects on polymer properties

2021 ◽  
Author(s):  
Liwei Guo ◽  
Wenjuan Zhang ◽  
Furong Cao ◽  
Youshu Jiang ◽  
Randi Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ethylene Polymerization ◽  
Chloride Complexes ◽  
Polymerization Catalyst ◽  
Polymer Properties

Four examples of para-dibenzocycloheptyl-substituted 2,6-bis(arylimino)pyridyl-iron(II) chloride complexes, [2,6-{(2-R1,4-(C15H13),6-R2C6H2)N=CMe}2C5H3N]FeCl2 (R1 = R2 = Me Fe1, Et Fe2, iPr Fe3, R1 = Me, R2 = Et Fe4), have been synthesized and characterized...

Syntheses and Spectral Properties of Tetra-(4,4-Dimethyl-Phenyl) Dithiolene Nickel Complex

2013 ◽  
Vol 469 ◽  
pp. 81-86
Author(s):  
Xue Hua Cheng ◽  
Xiu Lan Xin ◽  
Li Hua Yin ◽  
Yang Yu
Keyword(s):  
Thermal Stability ◽  
Melting Point ◽  
Infrared Spectrum ◽  
Spectral Properties ◽  
Nickel Complex ◽  
Near Infrared ◽  
Nickel Complexes ◽  
Raw Material ◽  
Synthesis Time ◽  
Photo Stability

Tetra-(4,4-dimethyl-phenyl) dithiolene nickel complex was synthesized by sulfuration with P2S5 and nickel complexs using bis-(4,4-dimethyl-phenyl) ethanedione as raw material. The structure of dithiolene nickel complexes was characterized by melting point, IR and 1HNMR. The maximum absorption spectra of this dithiolene nickel complexes in different solvent was measured by Ultraviolet-Visible-near Infrared Spectrum, and the photo stability and thermal stability were discussed. The results showed that this new method was used to synthesis bis-(4,4-dimethyl-phenyl) ethanedione, which greatly reduces the synthesis time compared to previous methods.

Study the Influences of ZnEt2 on Ethylene Chain Transfer Polymerization

2012 ◽  
Vol 602-604 ◽  
pp. 672-675
Author(s):  
An Guo Xiao ◽  
Shi Biao Zhou ◽  
Qing Yun Zheng ◽  
You Ming Shen ◽  
Yong Bin Zhuan
Keyword(s):  
Ethylene Polymerization ◽  
Nickel Complex ◽  
Chain Transfer ◽  
Ion Pairs ◽  
Catalyst System ◽  
Chain Propagation ◽  
Polymerization Mechanism ◽  
System 1 ◽  
Chain Transfer Polymerization

The influences of ZnEt2 on ethylene chain transfer polymerization were investigated in detail and the polymerization mechanism was thoroughly analyzed. The results indicated that ZnEt2 contributed greatly to increase the activity of α-diimine nickel complex/ZnEt2/MAO(MAO: methylaluminoxane). It was striking that α-diimine nickel complex/ZnEt2 catalyst system (1/100 mol/mol) exhibited 8.0 ×104g/mol∙h activity, it was possible the formation of the ion pairs of Nickel and Zinc was convenient for ethylene chain propagation, however, the ion pairs were unstable in ethylene polymerization.

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