C 2-Symmetric Ni(II) a-Diimines featuring cumyl-Derived ligands: Synthesis of improved elastomeric regioblock polypropylenes

Jeffrey M. Rose, Fanny Deplace, Nathaniel A. Lynd, Wang Zhigang, Atsushi Hotta, Emil B. Lobkovsky, Edward J. Kramer, Geoffrey W. Coates

研究成果: Article査読

84 被引用数 (Scopus)

抄録

A series of chiral, nickel α-diimine complexes featuring ligands based on bulky cumyl-substituted aniline moieties was synthesized. Each complex was capable of polymerizing propylene upon activation with methylaluminoxane (MAO). The catalysts were shown to be highly regioregular and isoselective for propylene polymerization at low temperature (e.g., -60 °C), whereas at higher reaction temperatures (e.g., 0 °C) the catalysts furnished regioirregular polypropylene (rirPP) composed of 1,2- and 3,1-enchainments. Many of the catalysts exhibited living behavior for propylene polymerization from -78 to 0 °C. From the screening results, the best catalyst was selected and used to produce regioblock polypropylenes featuring three or five blocks. Mechanical testing revealed that the materials exhibited good elastomeric behavior and improved performance at elevated temperatures (e.g., 65 °C) over block copolymers synthesized using a previously prepared chiral, nickel a-diimine catalyst

本文言語English
ページ(範囲)9548-9555
ページ数8
ジャーナルMacromolecules
41
24
DOI
出版ステータスPublished - 2008 12 23
外部発表はい

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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