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Plotting log([η]/M 1/2 ) versus log(N/N c ) where [η] is the intrinsic viscosity of the macromolecular chain of molecular mass equal to M and N/N c  is the number of blobs of which this chain consists (N: the number of statistical segment of the chain and N c  : the number of statistical segment of one blob), we obtain the unperturbed dimensions parameter of the blob, K θb . This graphical representation in this article is based on a modified, original equation of Han [6] based on the blob theory. The obtained value of K θb  for a given polymer, dissolved in a good solvent, is lower than the unperturbed dimensions parameter, K θ , obtained for the same polymer in the Flory’s theta conditions. Having K θb  &lt; K θ  we obtain for the viscometric expansion factors of a polymer, based on K θb  or K θ , α ηb  &gt; α η . With the obtained values of α ηb  we find α ηb  3 /α s  2 α H  ≈ 1, as predicted by Weill and des Cloizeauz [1], where using α η  we obtain α η  3 /α s  2 α H  ≈ 0.85 (α s  and α H  are the static and dynamical expansions factors).

Unperturbed dimensions of polymers revisited through the blob theory: the viscometric expansion factor