Progress in vanadium complex catalysts and their catalytic behavior toward copolymerization of ethylene with α-olefins

Abstract

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Imidazolidin-2-iminato vanadium complexes for the synthesis of ethylene/propylene/5-ethylidene-2-norbornene (ENB) terpolymers with high ENB incorporation and ultra-high molecular weight

“…The relative amount of the cocatalyst plays a key role in the copolymerization of ethylene with propylene. Different from some vanadium complexes which could be reduced by the cocatalyst, 26–29 both the catalytic activity and propylene incorporation ratio are retained with a further increase in the Al/V molar ratio from 150 to 500. The results indicate that the stability of the active center could be improved by introducing 6e imidazolidin-2-iminato ligands.…”

“…Catalysts occupy an important position in the control of the copolymerization ability and molecular weight of the resulting EPDMs in the coordination polymerization of ethylene, propylene and non-conjugated dienes. 7,[26][27][28][29][30][31] In this regard, the development of new catalytic systems allowing for the preparation of EPDM with ultra-high molecular weight and high ENB content is essential. Of the abundant catalysts, vanadium complexes present particularly good copolymerization ability in ethylene/propylene copolymerization, affording ethylenepropylene copolymers with high molecular weight.…”

“…Of the abundant catalysts, vanadium complexes present particularly good copolymerization ability in ethylene/propylene copolymerization, affording ethylenepropylene copolymers with high molecular weight. 7,[26][27][28][29][30][31] We have reported that NHC ligands play important roles in the control of molecular weight of the resulting copolymers. 12,[32][33][34] Vanadium complexes containing NHC ligands V1-V4 (as shown in Chart 1) display quasi-living characteristics in the copolymerization of ethylene with propylene, affording ethylene-propylene copolymers with ultra-high molecular weight (M w = 1612 kg mol −1 ).…”