Lifetime of the Growing Polymeric Chains

Detbemination of the Mean Lifetime from THE Number of Active Centers 

The data summarized in the previous paragraphs (namely, over-all polymerization rate, average polymerization degree for isotactic polymer, and number of active centers) enabled us to evaluate the mean lifetime of the 

The assumption was made that the growth life is related to the time during which the polymeric chain remains bound to the active center. 

The determination of the mean lifetime of the growing macromolecules was made under the following conditions t = 70 , PcaHi = 950 mm. Hg. We have considered that polymeric fraction for which the relationship between intrinsic viscosity and average numerical polymerization degree is known (see Sec. Ill, I). 

The number of isotactic chains growing at the same time, was assumed as being equal to the number of conventional active centers 1 X 10 mol./ mol. of a-TiCla. The results obtained are plotted in Fig. 36. 

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