Synthesis of Low Density Poly(ethylene) Using Nickel Iminophosphonamide Complexes

Ethylene polymerization using a catalyst derived from the reaction of the phosphorane (Me3Si)2NP(NSiMe3)2 (1) with either Ni(COD)2 or bis(π-allyl)Ni complexes affords branched poly(ethylene) (PE) of variable MW (103−106) depending on conditions. The branched PE of high MW is semicrystalline with T...

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Bibliographic Details
Published in:Macromolecules 2007-05, Vol.40 (9), p.2993-3004
Main Authors: Stapleton, Russell A., Chai, Jianfang, Nuanthanom, Anuttra, Flisak, Zygmunt, Nele, Marcio, Ziegler, Tom, Rinaldi, Peter L., Soares, Joao B. P., Collins, Scott
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Ethylene polymerization using a catalyst derived from the reaction of the phosphorane (Me3Si)2NP(NSiMe3)2 (1) with either Ni(COD)2 or bis(π-allyl)Ni complexes affords branched poly(ethylene) (PE) of variable MW (103−106) depending on conditions. The branched PE of high MW is semicrystalline with T m < 100 °C. High field 13C NMR spectra reveal the presence of methyl branches (ca. 10−15 per 1000 C atoms), branches longer than six C atoms (15−20 per 1000 C atoms) and trace levels of ethyl, propyl, n-butyl, and sec-butyl branches (total
ISSN:0024-9297
1520-5835
DOI:10.1021/ma062332f