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Facile Preparation and Activation of High‐Productivity Single‐Site Nickel Catalysts for Highly Linear Polyethylene
Author(s) -
Pickel Marco,
Casper Thomas,
Rahm Annette,
Dambouwy Christian,
Chen Peter
Publication year - 2002
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200290016
Subject(s) - chemistry , catalysis , nickel , toluene , ethylene , polyethylene , transition metal , lewis acids and bases , linear low density polyethylene , polymerization , stoichiometry , polymer , polymer chemistry , organic chemistry , inorganic chemistry
A easy‐to‐prepare series of nickel complexes are reported, which, upon activation with near‐stoichiometric alkylating agents, polymerize ethylene with turnover number (TON) of over 10 5 , which brings the catalyst into the range of commercial single‐site catalysts based on early transition metals. However, in contrast to the usual metallocenes, the catalyst shows the same activity in coordinating solvents such as THF and dioxane as it shows in toluene. Moreover, the polymer produced is highly linear, which, together with the long catalyst lifetime, suggests that the combination of the nickel catalyst and a Lewis acid suppresses formation of nickel hydrides.