Immobilization of α-diimine nickel (II) catalysts on multi-walled carbon nanotube for slurry ethylene polymerization

摘要: Homogeneous α-diimine nickel (II) catalyst complexes, with and without amino para-aryl position functionality, were synthesized. These complexes immobilized on carboxyl, hydroxyl, acyl chloride functionalized multi-walled carbon nanotubes to form five novel heterogeneous α-diiminonickel catalysts. Immobilization was performed by covalent or electrostatic bonding via methylaluminoxane (MAO) linker amide linkage. All the catalysts fully characterized their structures supporting efficiencies determined. Both nature of ligands kind interaction between anchored nanotube surface influenced catalytic performance, microstructure, morphology obtained polyethylenes. Catalysts bonds showed higher activities than physisorbed ones trend activity rising versus temperature. Reaction ligand functionality resulted in immobilization through This procedure prepared lowest relative weight loss thermogravimetry analysis highest up 5863 g PE mmol−1Ni h−1. The produced polyethylene dense botryoidal morphology, molecular distributions melting points 14.1 at 60 °C 133 °C 30 °C polymerization trials, respectively.