abstract |
The invention relates to a catalytic system based on at least one rare earth metallocene and as co-catalyst of an organomagnesium of formula X-Mg-RA-Mg-X, RA being an aliphatic divalent hydrocarbon chain, interrupted or not by an oxygen atom, a sulfur atom or by an arylene group, X being a halogen atom. It allows the synthesis of diene and/or ethylenic telechelic polymers. |