An index of the molecular weight dispersity of a polymer is afforded by the ratio of viscosity‐average molecular weights in two different solvents. The index is proportional to the weight‐ to number‐average molecular weight ratio. The simplicity and ease with which this index can be experimentally obtained is bought to a certain extent by loss of reliability. Extensions of the proposed procedure leading to characterization of the molecular weight distribution are discussed.
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Frisch et al. (1959) studied this question.
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