| http://www.w3.org/ns/prov#value | - formed.A further object of the invention is to apply these new associations to the polymerisation of conjugated dienes, in particular in non-polar solvents.The association has the following general formula:in which: n and n' are the numbers of mols of each compound, R is an alkyl or aryl radical, M is an alkali metal chosen from amongst lithium, sodium or potassium and Z is a hydride
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