Synthesis of High-Molecular-Weight Polypropylene Elastomer by Propylene Polymerization Using α-Diimine Nickel Catalysts.

ABSTRACT: The α-diimine late transition metal catalyst represents a new strategy for the synthesis of atactic polypropylene elastomer. Taking into account the properties of the material, enhancing the molecular weight of polypropylene at an elevated temperature through modifying the catalyst structure, and further increasing the activity of α-diimine catalyst for propylene polymerization, are urgent problems to be solved. In this work, two α-diimine nickel(II) catalysts with multiple hydroxymethyl phenyl substituents were synthesized and used for propylene homopolymerization. The maximum catalytic activity was 5.40 × 10⁵ gPP/molNi·h, and the activity was still maintained above 10⁵ gPP/molNi·h at 50 °C. The large steric hindrance of catalysts inhibited the chain-walking and chai

SUBMITTER: Gao L 

PROVIDER: S-EPMC11359258 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature