HIGHLIGHTS
SUMMARY
The relaxations after cessation of the steady elongations exhibit the three regimes originating from the dynamics of short, long, or both short and long polymer chains. The theoretical and numerical models of polymers have rationalized the molecular-based mechanism and reproduced the rheological properties by considering the coupled dynamics among the polymer chains. In their results, at elongational strain rates below the inverse of the Rouse relaxation time of the long-chain component, suppressing the stretches of the long chains improves the rheological predictions. Specifically, unlike a monodispersed system where the state of a . . .
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