Macromolecular Coil in a Flow

The mechanism of small-scale (fast) relaxation of conformation of the macromolecule does not change at the transition from weakly to strongly entangled systems the times of relaxation are defined by formulae (4.31). However, one has to take into account, that ip c 1 for weakly entangled systems, whereas ip 1 for strongly entangled systems, so that one has for the largest of the fast relaxation times 

One can see that the relaxation times at a (ip/x) 2 are the Rouse relaxation times of the part of the macromolecule that correspond approximately to the length of the macromolecule between adjacent entanglements Me. There is an interval between slow and fast relaxation times, which is the bigger the longer the macromolecules. 

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The speed of rotation of the macromolecular coil in a flow fl3i is determined by the velocity gradients... 

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