This contribution is concerned with a fragment of studies on homo- and copolymerization of dienes with catalytic systems formed from an organoaluminium compound and complexes of lanthanide metal halides (LnHal3). 3L, where L is an organic electron-donating ligand and Ln — lanthanide. It has been found that activity of systems under study depends both on the catalyst composition and on the type of lanthanide used and that changes in catalyst composition have an effect on the polymer chain growth rate constant Unexpectedly, it has also been found that polybutadiene microstructure depends on the AlR3-structure, what gave rise to the assumption that organoaluminium component participates in the formation of active centre of butadiene polymerization. An analysis of the results of studies on the effect of monomer concentration, polymerization temperature and type of solvent on catalyst activity led to the conclusion that active centres in lanthanide metal-complex catalysts have π-allilic structure.
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