METHOD OF PREPARATION Of an ELASTOMER DIENIQUE FONCTIANNALISE, SUCH AS a POLYBUTADIENE.

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The present invention relates to a method for preparing a functionalized diene elastomer, in particular a functionalized polybutadiene with a high proportion of cis -1, 4 having both a high Mooney viscosity and a low polydispersity index. The method according to the invention comprises the reaction of a catalyst system with at least one conjugated diene monomer to be polymerized, then adding a functionalizing agent to the elastomer thus obtained, said catalyst system is based on at least : -optionally a conjugated diene preforming, -a salt of one or more rare earth metals, -an inert hydrocarbon solvent, -an alkylating agent, and-a halogen donor excluding the alkylaluminum sesquihalides, and the incorporation of at least one Lewis base : (i) is, prior to said reaction, to said catalyst system during its synthesis, (ii) is, in said reaction, to said polymerization medium comprising said catalyst system (s) and the said monomer (s) (s) to be polymerized.