Ni(acac)(2)-DAD/MAO: A new catalytic system for ethylene polymerization

Authors
Zeng, XF Zetterberg, K
Citation
Xf. Zeng et K. Zetterberg, Ni(acac)(2)-DAD/MAO: A new catalytic system for ethylene polymerization, MACRO CH P, 199(12), 1998, pp. 2677-2681
Citations number
13
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR CHEMISTRY AND PHYSICS
ISSN journal
10221352 → ACNP
Volume
199
Issue
12
Year of publication
1998
Pages
2677 - 2681
Database
ISI
SICI code
1022-1352(199812)199:12<2677:NANCSF>2.0.ZU;2-8
Abstract
The halide-free combination of Ni(acac)(2) and DAD(diazadiene, ArN=CH-CH=NA r, where Ar=2r6-C6H3(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 d egree of branching of the obtained polyethylenes is substantially influence d by the polymerization conditions. The activation mechanism was investigat ed by H-1 NMR. MAO is proposed to participate in the Ligand exchange proces s.