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Sodium hyaluronate (NaHy) and sodium carboxymethyl cellulose (NaCMC) behave similarly with respect to concentration. N 3 of an added 1 : 1 electrolyte. The second virial coefficient A 2 (light scattering) is identical within experimental error at a given. N 3 . The limiting viscosity number [η] also varies with N 3 −1/2 in similar fashion for samples of similar [η] of the two polymers. Differences in Na + activity in salt‐free solutions are interpreted on the basis of weaker Na + binding in NaHy, presumably due to the greater charge separation along its chain backbone. Added electrolyte is excluded in dialysis more strongly by NaHy (or its acid form) than by NaCMC. The Flory parameter Φ is smaller in good solvents for NaHy, as for many other polyelectrolytes, than for nonionic polymers.
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Robert L. Cleland (1968) studied this question.
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