Abstract
This contribution is concerned with part of a study on the homopolymerization and copolymerization of dienes with a catalytic system formed from an organoaluminium compound, a Lewis acid and a neodymium salt. The stereospecific polymerization of butadiene was investigated with a neodymium octoate—diethylaluminium chloride—triethylaluminium catalyst in n-heptane. The concentration of the three catalyst components was varied and the results of the determination of conversion, microstructure and molecular weight are illustrated. The optimum catalyst concentration ratio of the butadiene polymerization was fixed and used for the copolymerization of butadiene/isoprene. Copolymers obtained under various monomer charge ratios were characterized by 1H-NMR spectroscopy. The intrinsic viscosity, the number average molecular weight and the reactivity ratios were also determined.
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