Multicentered self-immobilized ethylene polymerization catalysts based on functionalized titanium halide salicylaldiminate complexes for the synthesis of ultra-high-molecular-weight polyethylene

2012 ◽  
Vol 85 (9) ◽  
pp. 1404-1412 ◽  
Author(s):  
N. I. Ivancheva ◽  
S. Ya. Khaikin ◽  
E. V. Sviridova ◽  
S. P. Fedorov ◽  
D. V. Sanieva ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Polymerization Catalysts ◽  
Ultra High Molecular Weight

scholarly journals Enhancing thermostability of iron ethylene polymerization catalysts through N,N,N-chelation of doubly fused α,α′-bis(arylimino)-2,3:5,6-bis(hexamethylene)pyridines

2019 ◽  
Vol 9 (8) ◽  
pp. 1933-1943 ◽  
Author(s):  
Zheng Wang ◽  
Randi Zhang ◽  
Wenjuan Zhang ◽  
Gregory A. Solan ◽  
Qingbin Liu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
High Catalytic Activity ◽  
Polymerization Catalysts ◽  
Fe Catalyst

At temperatures up to 80 °C, high catalytic activity and high molecular weight PE was achievable using the Fe-catalyst depicted.

Advancing polyethylene properties by incorporating NO2 moiety in 1,2-bis(arylimino)acenaphthylnickel precatalysts: synthesis, characterization and ethylene polymerization

2017 ◽  
Vol 46 (21) ◽  
pp. 6934-6947 ◽  
Author(s):  
Qaiser Mahmood ◽  
Yanning Zeng ◽  
Xinxin Wang ◽  
Yang Sun ◽  
Wen-Hua Sun
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Ultra High Molecular Weight

A family of 1-(2,6-dibenzhydryl-4-nitrophenylimino)-2-aryliminoacenaphthylnickel halides, on activation with either Et2AlCl or EASC, produced ultra-high-molecular-weight highly branched polyethylenes.

α-Diimine nickel complexes bearing axially bulky terphenyl and equatorially bulky dibenzobarrelene groups: synthesis, characterization and olefin polymerization studies

2020 ◽  
Vol 11 (42) ◽  
pp. 6783-6793
Author(s):  
Xiaohua Wang ◽  
Bo Dong ◽  
Qi Yang ◽  
Heng Liu ◽  
Chunyu Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Olefin Polymerization ◽  
Nickel Complexes ◽  
Catalytic Activities ◽  
New Family ◽  
Ultra High Molecular Weight

A new family of asymmetric α-diimine nickel complexes bearing axially and equatorially bulky groups were synthesized successfully. They exhibited high catalytic activities for ethylene polymerization and afforded ultra-high-molecular-weight elastomeric polyethylenes.

Titanium amidate complexes as active catalysts for the synthesis of high molecular weight polyethylene

2015 ◽  
Vol 93 (7) ◽  
pp. 775-783 ◽  
Author(s):  
Patricia Horrillo-Martinez ◽  
David C. Leitch ◽  
Scott A. Ryken ◽  
Robert K. Thomson ◽  
J. David Beard ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Catalytic Polymerization ◽  
Binding Motifs ◽  
Co Catalyst ◽  
Multiple Binding ◽  
Polymeric Chains ◽  
Ultra High Molecular Weight

A series of titanium and zirconium bis(amidate) complexes of the type L2MX2, where L is an amidate ligand, and X is either –NMe2 or –Cl, were prepared in 60%–83% yield and fully characterized. Multiple binding motifs are observed as the amidate ligand can bind in κ1- and κ2-modes. These complexes were then subjected to screening the catalytic polymerization of ethylene. All catalysts, after reaction with suitable co-catalyst, were functional for ethylene polymerization, though not for the copolymerization of ethylene and longer linear 1-alkenes. Polyethylene was formed in the range of 1000–4000 kDa, and with PDI values as low as 1.3. These long polymeric chains are considered as ultra-high molecular weight polyethylene (UHMWPE).

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