The Catalytic Polymerization of Isoprene with Butyllithium

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Abstract
1. The kinetics for the polymerization of isoprene with butyllithium in a solution of saturated hydrocarbons were determined. 2. The reaction has the mechanism of a chain catalytic reaction, in which active centers appear that are involved complexes formed from metallorganic compounds and monomer-polymer molecules. 3. Deactivation of growing chains takes place as a result of the reaction of active centers with each other or with metallorganic compounds. With this there are formed new metallorganic compounds of high molecular weight capable of becoming new polymerization centers. 4. The polymer possesses a narrow range of molecular fractions, closely approximating the Gaussion distribution, but the value of the average molecular weight of the polymer after completion of polymerization is inversely proportional to the catalyst concentration. 5. The polymerization temperature, and also the concentrations of the monomer and catalyst, do not affect the microstructure of the polymer (content of 1,2 and 3,4 isoprene units).

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