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Entangledlike chain dynamics in nonentangled polymer blends with large dynamic asymmetry

AuthorsMoreno Segurado, Ángel J. ; Colmenero de León, Juan
KeywordsComputer simulation of molecular and particle dynamics in rheology
Reptation and tube theories in rheology
Polymer blends (rheology)
Issue Date28-Mar-2008
PublisherAmerican Physical Society
CitationPhysical Review Letters 100: 126001 (2008)
AbstractWe discuss simulations of a simple model for polymer blends in the framework of the Rouse model. At odds with standard predictions, large dynamic asymmetry between the two components induces strong nonexponentiality of the Rouse modes for the fast component. Despite chains being much shorter than the entanglement length, it also induces dynamic features resembling a crossover to entangledlike chain dynamics. This unusual behavior is associated with strong memory effects which break down the assumption of time uncorrelation of the external forces acting on the tagged chain.
Description4 pp.-- PACS nrs.: 83.10.Rs, 83.10.Kn, 83.80.Tc.-- PMID: 18517886.-- Pre-print versions available at arXiv: http://arxiv.org/abs/0708.3050.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.100.126001
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