Polymerization of hex-1-ene initiated by diimine complexes of nickel and palladium

Jan Merna (1) , Jaroslav Cihlar (1) , Miloslav Kucera (1) , Alain Deffieux (2, 3) , Henri Cramail (2, 4)

1 Brno Univ Technol, Inst Mat Chem
2 LCPO - Laboratoire de Chimie des polymères organiques
3 Team 1 LCPO : Polymerization Catalyses & Engineering
4 Team 2 LCPO : Biopolymers & Bio-sourced Polymers

The effect of monomer concentration, reaction temperature and initiator structure on the activity, molar mass, branching and thermal properties of poly(hex-1-ene)s was investigated for the polymerization of hex-1-ene initiated by four alpha-diimine complexes of nickel and palladium. Hex-1-ene polymerization exhibits an apparent negative kinetic order with respect to monomer concentration. Polymerization of hex-1-ene initiated by MAO activated 1,4-bis(2, 6-diisopropylphenyl)acenaphtenediiminenickel(II) dibromide (1a/MAO) proceeds in living-like fashion not only at sub-zero temperatures but even at 20degreesC. However, molar masses of the polymers are higher than predicted values in agreement with an initiator efficiency lower than one.

Mots clés: nickel catalyst; living polymerization; kinetics (polym.); structure; polyolefins

Domaines: Polymères

Jan Merna, Jaroslav Cihlar, Miloslav Kucera, Alain Deffieux, Henri Cramail. Polymerization of hex-1-ene initiated by diimine complexes of nickel and palladium. European Polymer Journal, 2005, 41 (29), pp.303-312. ⟨10.1016/j.europolymj.2004.09.013⟩. ⟨hal-00393813⟩