The bis(imino)pyridyl vanadium(III) complex [VCl 3-{2,6-bis[(2,6-iPr2C6H 3)N=C(Me)]2(C5H3N)}] activated with different aluminium cocatalysts (AlEt2Cl, Al2Et 3Cl3, MAO) promotes chemoselective 1,4-polymerization of butadiene with activity values higher than classical vanadium-chloride-based catalysts. The polymer structure depends on the nature of the cocatalyst employed. The MAO-activated complex was also found to be active in ethylene-butadiene copolymerization, producing copolymers with up to 45 mol-% of trans-1,4-butadiene. Crystalline polyethylene and trans-1,4-poly(butadiene) segments were detected in these copolymers by DSC and 13C NMR spectroscopy.
Homo e Copolymerisation of Butadiene catalysed by an Bis(imino)pyridyl Vanadium Catalyst
CUOMO, Cinzia;MILIONE, Stefano;GRASSI, Alfonso
2004
Abstract
The bis(imino)pyridyl vanadium(III) complex [VCl 3-{2,6-bis[(2,6-iPr2C6H 3)N=C(Me)]2(C5H3N)}] activated with different aluminium cocatalysts (AlEt2Cl, Al2Et 3Cl3, MAO) promotes chemoselective 1,4-polymerization of butadiene with activity values higher than classical vanadium-chloride-based catalysts. The polymer structure depends on the nature of the cocatalyst employed. The MAO-activated complex was also found to be active in ethylene-butadiene copolymerization, producing copolymers with up to 45 mol-% of trans-1,4-butadiene. Crystalline polyethylene and trans-1,4-poly(butadiene) segments were detected in these copolymers by DSC and 13C NMR spectroscopy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
