Entangled system diffusive branch

Note that the first and the second terms in (6.49) at w —> oo have the orders of magnitudes nTib 2 and nTy-1, respectively. The ratio of the quantities is very small for systems of long macromolecules, so that the contribution of the first, conformation branch to the linear viscoelasticity is negligibly small at X x. Note also that, for strongly entangled systems, at x X or Af M, as it was shown in Section 4.2.3, conformational relaxation cannot be occurred via the diffusive mechanism (considered here), but via the reptation mechanism, so that the first term in equation (6.49) ought to be replaced by other term, for example, in the form... 

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