Influence of Ligand Backbone Structure and Connectivity on the Properties of Phosphine-Sulfonate Pd(II)/Ni(II) Catalysts

Phosphine-sulfonate based palladium and nickel catalysts have been extensively studied in ethylene polymerization and copolymerization reactions. Previously, the majority of the research works focused on the modifications of the substituents on the phosphorous atom. In this contribution, we systemat...

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Bibliographic Details
Published in:Polymers 2017-05, Vol.9 (5), p.168
Main Authors: Wu, Zixia, Hong, Changwen, Du, Hongxu, Pang, Wenmin, Chen, Changle
Format: Article
Language:English
Subjects:
Backbone
Benzene
Catalysts
Copolymerization
Ethylene
Ligands
Molecular structure
Molecular weight
Naphthalene
Nickel
Palladium
Polyethylene
Polyethylenes
Polymerization
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Summary:Phosphine-sulfonate based palladium and nickel catalysts have been extensively studied in ethylene polymerization and copolymerization reactions. Previously, the majority of the research works focused on the modifications of the substituents on the phosphorous atom. In this contribution, we systematically demonstrated that the change of the ligand backbone from benzene to naphthalene could greatly improve the properties of this class of catalysts. In the palladium system, this change could increase catalyst stability and polyethylene molecular weights. In the nickel system, this change could dramatically increase the polyethylene molecular weights. Most interestingly, the change in the connectivity of phosphine and sulfonate moieties to the naphthalene backbone could also significantly influence the catalyst properties.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym9050168