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

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

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

Original languageEnglish
Pages (from-to)9548-9555
Number of pages8
JournalMacromolecules
Volume41
Issue number24
DOIs
Publication statusPublished - 2008 Dec 23
Externally publishedYes

ASJC Scopus subject areas

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

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    Rose, J. M., Deplace, F., Lynd, N. A., Zhigang, W., Hotta, A., Lobkovsky, E. B., Kramer, E. J., & Coates, G. W. (2008). C 2-Symmetric Ni(II) a-Diimines featuring cumyl-Derived ligands: Synthesis of improved elastomeric regioblock polypropylenes. Macromolecules, 41(24), 9548-9555. https://doi.org/10.1021/ma8019943