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- Title
Titanium amidate complexes as active catalysts for the synthesis of high molecular weight polyethylene.
- Authors
Horrillo-Martinez, Patricia; Leitch, David C.; Ryken, Scott A.; Thomson, Robert K.; Beard, J. David; Patrick, Brian O.; Schafer, Laurel L.; Giesbrecht, Garth R.
- Abstract
A series of titanium and zirconium bis(amidate) complexes of the type L2MX2, where L is an amidate ligand, and X is either -NMe2 or -Cl, were prepared in 60%-83% yield and fully characterized. Multiple binding motifs are observed as the amidate ligand can bind in κ1- and κ2-modes. These complexes were then subjected to screening the catalytic polymerization of ethylene. All catalysts, after reaction with suitable co-catalyst, were functional for ethylene polymerization, though not for the copolymerization of ethylene and longer linear 1-alkenes. Polyethylene was formed in the range of 1000-4000 kDa, and with PDI values as low as 1.3. These long polymeric chains are considered as ultra-high molecular weight polyethylene (UHMWPE).
- Subjects
TITANIUM compounds synthesis; ZIRCONIUM compounds synthesis; COMPLEX compounds synthesis; LIGANDS (Chemistry); CATALYTIC polymerization; ETHYLENE; ALKENES; ULTRAHIGH molecular weight polyethylene
- Publication
Canadian Journal of Chemistry, 2015, Vol 93, Issue 7, p775
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2015-0081