The validity of the Flory‐Fox treatment of the friction constant is investigated for chains with excluded volume with the aid of theories due to Kirkwood and to Fixman. It is found that the effective hydrodynamic radius of a linear macromolecule is less affected by excluded volume than the radius of gyration, and hence that the Flory‐Fox number P should decrease slightly with increasing molecular weight or solvent power.
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Stockmayer et al. (1958) studied this question.
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