Effect of aryloxo ligand for ethylene polymerization by (arylimido)(aryloxo)vanadium(V) complexes-MAO catalyst systems: Attempt for polymerization of styrene

Catalysis Communications

Volumn 4, Issue 4, 2003, Pages 159-164

  Wang, Wei ^a   Yamada, Junji ^a   Fujiki, Michiya ^a   Nomura, Kotohiro ^a  

^a NARA INSTITUTE OF SCIENCE AND TECHNOLOGY   (Japan)

Author keywords

Ethylene polymerization; Homogeneous catalysis; Ligand effect; Vanadium

Indexed keywords

CATALYST ACTIVITY; COMPLEXATION; COPOLYMERS; ETHYLENE; OLEFINS; ORGANOMETALLICS; POLYMERIZATION; STYRENE; SUBSTITUTION REACTIONS; VANADIUM; VANADIUM COMPOUNDS;

ETHYLENE POLYMERIZATIONS; HOMOGENEOUS CATALYSIS; LIGAND EFFECTS;

CATALYSTS;

EID: 1642398765     PISSN: 15667367     EISSN: None     Source Type: Journal    
DOI: 10.1016/S1566-7367(03)00028-1     Document Type: Article

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22. 2 AlCl was used, MAO has thus been chosen to compare the activity with high reproducibility.
23. In most cases, the results (catalytic activity) at low Al/V molar ratios were highly reproducible, but the lower activity was observed in several experimental runs. We think that this is due to impurities such as small amount of water and/or oxygen in the reaction mixture (in the present case, the amount of d-MAO is ca. 7 mg). Alkyl aluminum also plays a role to remove impurities in the solution.
24. In addition, the yield for atactic polystyrene was lower than that performed without vanadium catalyst under the same conditions. The result clearly indicates that present vanadium complex-MAO system did not catalyze styrene polymerization.