Macromolecular Research

  • 제14권3호
  • /
  • Pages.306-311
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  • 2006
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  • 1598-5032(pISSN)
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  • 2092-7673(eISSN)
한국고분자학회 (The Polymer Society of Korea)
권호 표지

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)
  • 발행 : 2006.06.01
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초록

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.

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