PROCEEDED OF PREPARATION Of an ELASTOMER DIENIQUE FUNCTIONALIZES, SUCH AS a POLYBUTADIENE.

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The invention relates to a method for preparing a functionalised diene elastomer, in particular a functionalised polybutadiene with a high cis-1, 4 chaining rate having both a high Mooney viscosity and a low polydispersity index. The method of the invention comprises reacting a catalytic system with at least one conjugated diene monomer to be polymerised, and adding a functionalising agent to the elastomer thus obtained, said catalytic system including at least : optionally, a preformation conjugated diene; a salt of one or more rare earth metals; an inert hydrocarbon solvent; and alkylation agent; and a halogen donor with the exception of alkylaluminium sesquihalides; and the incorporation of at least one Lewis base : (i) either, before said reaction, in the catalytic system during the synthesis thereof, (ii) or, during said reaction, in said polymerising medium including said catalytic system and said monomer(s) to be polymerised.