Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Polymerizations of Propylene with Unsymmetrical ($\alpha$-Diimine)nickel(II) Catalysts

  • Jeon Man-Seong (Polyolefin Materials Research Center, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology) ;
  • Han Chul-Jong (Polyolefin Materials Research Center, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology) ;
  • Kim Sang-Youl (Polyolefin Materials Research Center, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology)
  • Published : 2006.06.01
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Abstract

New unsymmetrical ($\alpha$-Diimine)nickel(II) 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 $^1H\;and\;^{13}C\;NMR$ showed that the ortho substituents on aromatic rings of ($\alpha$-diimine)nickel(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, $C_1$ 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.

Keywords

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