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Ni(acac) 2 ‐DAD/MAO: A new catalytic system for ethylene polymerization
Author(s) -
Zeng Xiaofeng,
Zetterberg Krister
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19981201)199:12<2677::aid-macp2677>3.0.co;2-t
Subject(s) - methylaluminoxane , polymer chemistry , ethylene , polymerization , branching (polymer chemistry) , coordination polymerization , catalysis , chemistry , polymer , copolymer , solution polymerization , metallocene , organic chemistry
The halide‐free combination of Ni(acac) 2 and DAD(diazadiene, ArNCHCHNAr, where Ar = 2,6‐C 6 H 3 (i‐Pr) 2 ) is active for ethylene polymerization in the presence of methylaluminoxane (MAO). The performance of this new catalytic system was evaluated with respect to activity and polymer structure. The degree of branching of the obtained polyethylenes is substantially influenced by the polymerization conditions. The activation mechanism was investigated by 1 H NMR. MAO is proposed to participate in the ligand exchange process.