Abstract
ABSTRACT By continuing the research study, which has been referred to in previous papers, we have demonstrated that in the polymerization of propylene with the aid of limited concentration of triethyl aluminum, the main process of termination of the growing chain is one equivalent to a chain transfer with the monomer. Working with low partial pressures of propylene, a process of chain termination, independent of the concentration of the monomer and of the catalyst, was observed. The effect of this process on the lowering of molecular weights, below 80°C, is rather limited. The mechanisms of the different processes identified (growth, transfer, and termination), which are of interest to the overall process of polymerization, are here discussed.
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