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The problem of the systematic error of fractionation methods and its dependence on the selectivity of polymer separation are discussed. Comparisons of the results of a theoretical analysis and of an experimental fractionation by means of summative and of successive methods of fractionation are presented. For the purpose of comparing the polydispersity of polymers, the application of the method of fractionation into summative fractions alone is sufficient, since the results of this method depend only on the selectivity.
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Broda et al. (1958) studied this question.
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