ethylene oligomers
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Macromol ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 121-129
Author(s):  
Ilaria D’Auria ◽  
Zeinab Saki ◽  
Claudio Pellecchia

Nickel-based ethylene polymerization catalysts have unique features, being able to produce macromolecules with a variable content of branches, resulting in polymers ranging from semicrystalline plastics to elastomers to hyperbranched amorphous waxes and oils. In addition to Brookhart’s α-diimine catalysts, iminopyridine Ni(II) complexes are among the most investigated systems. We report that Ni(II) complexes bearing aryliminopyridine ligands with bulky substituents both at the imino moiety and in the 6-position of pyridine afford either hyperbranched low molecular weight polyethylene oils or prevailingly linear crystalline polyethylenes or both, depending on the ligand structure and the reaction conditions. The formation of multiple active species in situ is suggested by analysis of the post-polymerization catalyst residues, showing the partial reduction of the imino function. Some related arylaminopyridine Ni(II) complexes were also synthesized and tested, showing a peculiar behavior, i.e., the number of branches of the produced polyethylenes increases while ethylene pressure increases.


2021 ◽  
Author(s):  
Shuaikang Li ◽  
Zhou Lu ◽  
Weigang Fan ◽  
Shengyu Dai

Hyperbranched polar functional ethylene oligomers with very high incorporation can be accessible via ethylene–MA co-oligomerization with iminopyridyl Pd(ii) catalysts.


2019 ◽  
Vol 115 ◽  
pp. 185-192 ◽  
Author(s):  
Lihua Guo ◽  
Wenjing Liu ◽  
Kun Li ◽  
Mengmeng Sun ◽  
Wenting Sun ◽  
...  

2019 ◽  
Vol 10 (20) ◽  
pp. 2596-2607 ◽  
Author(s):  
Xin Ma ◽  
Xiaoqiang Hu ◽  
Yixin Zhang ◽  
Hongliang Mu ◽  
Lei Cui ◽  
...  

Chain-end-functionalization of (highly) branched ethylene oligomers was achieved in situ with the most/least bulky α-diimine nickel catalysts for the first time.


2018 ◽  
Vol 38 (3) ◽  
pp. 614-625 ◽  
Author(s):  
Cláudia A. Figueira ◽  
Patrícia S. Lopes ◽  
Clara S. B. Gomes ◽  
Joselaine C. S. Gomes ◽  
Luis F. Veiros ◽  
...  

2014 ◽  
Vol 136 (5) ◽  
pp. 2078-2085 ◽  
Author(s):  
Thomas Wiedemann ◽  
Gregor Voit ◽  
Alexandra Tchernook ◽  
Philipp Roesle ◽  
Inigo Göttker-Schnetmann ◽  
...  
Keyword(s):  

2014 ◽  
Vol 43 (37) ◽  
pp. 13913-13923 ◽  
Author(s):  
Margaret Yankey ◽  
Collins Obuah ◽  
Ilia A. Guzei ◽  
Emmanuel Osei-Twum ◽  
Giovanni Hearne ◽  
...  

(Salicyladimine)iron(iii) pre-catalysts, from iron(ii) precursors, form catalysts for ethylene oligomerisation, polymerisation and alkylation of aromatic solvents by the ethylene oligomers.


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