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Equations are derived for the differential molecular weight distribution curve and for the heterogeneity index for several types of delayed initiator addition in anionic polymerization. All the results are in closed and easily used form, and depend only upon the product of the rate constant of the propagation reaction, the total initiator concentration, and a parameter representative of the rate of initiator addition. The results are plotted versus the above‐mentioned product, so that one can determine the heterogeneity index to be expected under a wide range of the variables involved.
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Eisenberg et al. (1966) studied this question.
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