Abstract
AbstractFive β‐ketoimine vanadium(III) catalysts with promising thermal stability are employed to promote efficient ethylene/dicyclopentadiene (DCPD), ethylene/5‐ethylidene‐2‐norbornene (ENB), and ethylene/5‐vinyl‐2‐norbornene (VNB) copolymerizations, respectively. These vanadium catalysts show high activities toward ethylene/DCPD and ethylene/ENB copolymerization, producing copolymers with high molecular weight and co‐monomer incorporations. By contrast, they exhibit moderate activities toward ethylene/VNB copolymerization and afford copolymers with much lower molecular weight and co‐monomer incorporation. This can be ascribed to less steric hindrance around the pendant vinyl group in VNB. All of the selected catalysts exhibit a single‐site catalytic behavior during the copolymerization. These dienes enchained by vinyl‐type addition via the intra cyclic CC bonds of norbornene and the extra CC bonds are totally maintained as unreacted. Besides, the conversion rates of the monomer, as well as the molecular weight and co‐monomer contents of the copolymers can be effectively regulated by varying the structure of catalysts and the processing parameters.
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