The tracer-diffusion coefficient Dₜ of polystyrene chains in semidilute, good-solvent solutions has been measured by forced Rayleigh light scattering for different polymerization indices of both labeled and unlabeled chains (N and P, respectively). For P/N5, Dₜ is found to be independent of P, and a pure reptative behavior is observed in the entire semidilute concentration range. For P/N<5, the increase of Dₜ when P is decreased demonstrates the existence of tube-renewal effects whose magnitude, for a given P, only depends on the number of entanglements along the test chains.
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Marmonier et al. (1985) studied this question.
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