The effect of the nature of organoaluminium compound and the catalytic system preparation procedure on molecular characteristics of 1,4‐Cis‐polybutadiene

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Abstract
This study investigated the effect produced by the preparation procedure of a 2‐component lanthanide catalytic system and by the nature of organoaluminium compound on 1) the molecular characteristics of 1,4‐cis‐polybutadiene (PB), 2) the regularities of its average molecular weight (MW), and 3) molecular weight distribution (MWD). The kinetic parameters of the polymerization process were calculated. The principal regularities of variations in PB molecular characteristics with respect to the polymerization conditions, i.e., OAC and monomer concentrations and temperature, are retained with different procedures of the lanthanide catalytic system, and those present distinctive features of the catalytic complexes studied in this article. But as for differences in MW and its patterns of dependence on monomer conversion rate and OAC nature, these are due to changes in kinetic parameters of the polymerization, which occur with the use of the catalyst prepared by a different procedure. © 1994 John Wiley & Sons, Inc.