Ring size enlargement in an ortho ‐cycloalkyl‐substituted bis(imino)pyridine‐cobalt ethylene polymerization catalyst and its impact on performance and polymer properties

2021 ◽  
Author(s):  
Mingyang Han ◽  
Ivan I. Oleynik ◽  
Ming Liu ◽  
Yanping Ma ◽  
Irina V. Oleynik ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Ring Size ◽  
Polymerization Catalyst ◽  
Polymer Properties

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...

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

Integrating Ring‐Size Adjustable Cycloalkyl and Benzhydryl Groups as the Steric Protection in Bis(arylimino)trihydroquinoline‐Cobalt Catalysts for Ethylene Polymerization

2021 ◽  
Vol 2021 (38) ◽  
pp. 3956-3968
Author(s):  
Randi Zhang ◽  
Irina V. Oleynik ◽  
Jianqing Li ◽  
Gregory A. Solan ◽  
Yanping Ma ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Cobalt Catalysts ◽  
Ring Size

scholarly journals Silyl diol ester as a new selectivity control agent in MgCl2-supported Ziegler–Natta systems for propylene polymerization: catalyst structure and polymer properties

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7420-7431 ◽  
Author(s):  
Fatemeh Poorsank ◽  
Hassan Arabi ◽  
Nona Ghasemi Hamedani
Keyword(s):  
Control Agent ◽  
Propylene Polymerization ◽  
External Donor ◽  
Catalyst Structure ◽  
Internal Donor ◽  
Polymerization Catalyst ◽  
Polymer Properties ◽  
Selectivity Control ◽  
Diol Ester

In this study, bis(benzoyloxy)dimethylsilane (SDE) was developed as a non-phthalate selectivity control agent (internal donor (ID) and external donor (ED)) in MgCl2-supported Ziegler–Natta (ZN) systems for polypropylene polymerization.

scholarly journals Supersize Cp! Tetrabenzo[a,c,g,i]fluorenyl complexes of yttrium

2017 ◽  
Vol 95 (4) ◽  
pp. 363-370 ◽  
Author(s):  
Jianlong Sun ◽  
David J. Berg ◽  
Brendan Twamley
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Ethylene Polymerization ◽  
Nmr Studies ◽  
X Ray ◽  
X Ray Crystallography ◽  
Trinuclear Cluster ◽  
Polymerization Catalyst ◽  
Dynamic Nuclear Magnetic Resonance ◽  
Trimethylsilyl Isocyanate

The synthesis of tetrabenzo[a,c,g,i]fluorenyl (Tbf) yttrium dialkyl complexes, (Tbf)Y(CH2SiMe3)2(L) (L = tetrahydrofuran (THF), 1; L = bipy, 2), by direct protonolysis of the tris(alkyl) complex, Y(CH2SiMe3)3(THF)2, are reported. The X-ray crystal structures of 1 and 2 display the helical twisting typically observed for the Tbf ligand. Dynamic nuclear magnetic resonance (NMR) studies on 1 show a barrier to Tbf helical inversion (epimerization or “wagging”) of 38.1 ± 0.5 kJ mol−1. The reaction of 1 with acidic hydrocarbons such as 1,3-bis(trimethylsilyl)cyclopentadiene or trimethylsilylacetylene results in protonolysis to form the mixed Cp derivative [(Tbf){C5H3(SiMe3)2}Y(CH2SiMe3)(THF)] (3) or [(Tbf)Y(CCSiMe3)2(THF)]n (4), respectively. In the case of 4, a small amount of the trinuclear cluster (Tbf)Y3(μ3-CCSiMe3)2(μ2-CCSiMe3)3(CCSiMe3)3(THF)2 (5) was isolated and characterized by X-ray crystallography. Dialkyl 1 undergoes smooth insertion of trimethylsilyl isocyanate to afford [(Tbf)Y{κ2-(N,O)-Me3SiN(Me3SiCH2)CO}2(THF)] (6) but it does not react with alkenes. Treating 1 with [Ph3C]+[B(C6F5)4]− in bromobenzene generates a moderately active ethylene polymerization catalyst (36 kg mol−1 h−1 bar−1).

Mechanism of Initiation in the Phillips Ethylene Polymerization Catalyst: Redox Processes Leading to the Active Site

ACS Catalysis ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 5574-5583 ◽  
Author(s):  
Carole Brown ◽  
J. Krzystek ◽  
Randall Achey ◽  
Adrian Lita ◽  
Riqiang Fu ◽  
...  
Keyword(s):  
Active Site ◽  
Ethylene Polymerization ◽  
Redox Processes ◽  
Polymerization Catalyst

Effects of ethylene polymerization conditions on the activity of SiO2-supported zirconocene and on polymer properties

1999 ◽  
Vol 37 (13) ◽  
pp. 1987-1996 ◽  
Author(s):  
Jo�o Henrique Zimnoch Dos Santos ◽  
Marcelo Barbosa Da Rosa ◽  
Cristiano Krug ◽  
Fernanda Chiarello Stedile ◽  
Monica Carcuchinski Haag ◽  
...  
Keyword(s):  
Ethylene Polymerization ◽  
Polymer Properties ◽  
Polymerization Conditions

IRS study of ethylene polymerization catalyst SiO2/methylaluminoxane/zirconocene

1999 ◽  
Vol 142 (1) ◽  
pp. 27-37 ◽  
Author(s):  
V.N. Panchenko ◽  
N.V. Semikolenova ◽  
I.G. Danilova ◽  
E.A. Paukshtis ◽  
V.A. Zakharov
Keyword(s):  
Ethylene Polymerization ◽  
Polymerization Catalyst
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