Relaxation of Probe Macromolecule

Equation (6.68) determines a critical length M, above which macromolecules of the additive do not reptate. The dependence of M /Me on Mo/Me, according to the above equation at 5 = 2.5, is depicted in Fig. 18 by solid line. For the matrix of short macromolecules, when Mo 10Me, the transition point is situated in the short-length region, so that the macromolecules of the additive, which are shorter than Mq but longer than M,  

The realisation of a certain mode of motion of a macromolecule among other macromolecules depends on the lengths of both diffusing macromolecule and macromolecules of the environment. The solid line M divides the dilute blends into those, in which macromolecules of the additive can reptate, and those, where no reptation occurs. The dashed line marks the systems with macromolecules of equal lengths. 

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