By analyzing the experimental data obtained by other researchers it is shown that the anomalous molecular-weight dependence of the partial specific volume of macromolecules in dilute solutions cannot be explained using the hypothesis of the "free volume" formed between colliding monomers. Another explanation is proposed in which this anomalous dependence is due to a reduction in the number of bends in the chain when there is an increase in the volume repulsion in the coil. This explanation is in better agreement with the experimental facts.
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