Polymerizations of propylene with unsymmetrical (alpha-diimine)nickel(II) catalysts

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New unsymmetrical (a-diimine)nickel(11) catalysts having different pendent groups at the ortho positions on aromatic rings were synthesized and subjected to propylene polymerizations with MAO (methylaluminoxane). Structural analyses of the resulting polypropylenes by H-1 and C-13 NMR showed that the ortho substituents on aromatic rings of (alpha-diimine)nicket(II) catalyst affected significantly the polypropylene microstructure. While C-s symmetric catalyst afforded a syndiotactic polypropylene (rr triad content=66%) due to the syndiospecific chain end control, C-s symmetric catalysts produced much less stereoregular polypropylenes (rr triads content < 50%), presumably because of collision,of the isospecific site control with the syndiospecific chain end control.
Publisher
POLYMER SOC KOREA
Issue Date
2006-06
Language
English
Article Type
Article
Keywords

SYNDIOTACTIC-SPECIFIC POLYMERIZATION; ALPHA-DIIMINE CATALYSTS; NICKEL-BASED CATALYSTS; LATE-METAL-CATALYSTS; OLEFIN POLYMERIZATION; ETHYLENE POLYMERIZATION; NEW-GENERATION; COMPLEXES; PROPENE; LIGANDS

Citation

MACROMOLECULAR RESEARCH, v.14, no.3, pp.306 - 311

ISSN
1598-5032
DOI
10.1007/BF03219086
URI
http://hdl.handle.net/10203/90973
Appears in Collection
CH-Journal Papers(저널논문)
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