THE INFLUENCE OF THE STRUCTURE OF THE ORG ANOALUMINUM COMPONENT ON THE POLYMERIZATION OF DIENES IN THE PRESENCE OF LANTHANOID CONTAINING CATALYTIC-SYSTEMS

The influence of the organoaluminium components on the functioning of lanthonoidal catalytic systems LnCl3 . 3TBP-AlR3 (TBP - Tributylphosph ate) was studied. In the polymerization of dienes on such catalysts, t he dependence of the rate of reaction initiation, the growth of the ch ain, the stereospecific effect, the stability of active centers, and a lso the copolymerization constant on the structure of AlR3 was determi ned. An analysis of the structural-kinetic system, taking into account anti-syn isomeric changes of the active center, enabled the evaluatio n of the constant for the elementary stages of the growth reaction in butadiene polymerization and showed the changes that took place on var ying AlR3. On this basis the conclusion was drawn that lanthonoidal ac tive centers include organoaluminium fragments in its structure, whose capability for exchange was demonstrated experimentally. The results of the theoretical calculations of the model complex agree with such a view.