Abstract
AbstractPolymerizations of isoprene in n‐heptane medium catalyzed by the systems Et2AlX + TiCl4 (X = F, Cl, Br) are characterized by a strong dependence of the reaction rate on the Al/Ti ratio. Changes in the polymerization rate are accompanied by the changes of the microstructure of polymers. Polymers obtained at Al/Ti ratios lower than 1.5 contain very low amounts of common linear forms and can be thus considered as practically cyclic. The highest polymerization rate in formation of cyclic polymers lies for all three diethylaluminum halide catalysts at the ratio Al/Ti = 0.75. The systems EtAlX2 + TiCl4 are considered as actual catalysts. When diethylaluminum iodide is used as the organoaluminum compound formation of cyclopolymers takes place at all Al/Ti ratios.
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