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Quasielastic neutron scattering and molecular dynamics simulation data fromPEO/PMMA blends found that for short times the self-dynamics of PEO chainfollows the Rouse model, but at longer times past tc=1 to 2 ns it becomesslower and departs from the Rouse model in dependences on time, momentumtransfer, and temperature. To explain the anomalies, others had proposed therandom Rouse model (RRM) in which each monomer has different mobility takenfrom a broad log-normal distribution. Despite the success of the RRM, Diddens,Brodeck and Heuer [EPL, 95, 56003 (2011)] extracted the distribution offriction coefficients from the MD simulations of a PEO/PMMA blend and found thedistribution is much narrower than expected from the RRM. We propose a simpleralternative explanation of the data by utilizing alone the observed crossoverof PEO chain dynamics at tc. The present problem is just a special case of ageneral property of relaxation in interacting systems, which is the crossoverfrom independent relaxation to coupled many-body relaxation at some tcdetermined by the interaction potential. The generality is brought out vividlyby pointing out that the crossover also had been observed by neutron scatteringfrom entangled chains relaxation in monodisperse homo-polymers, and from thesegmental \alpha-relaxation of PEO in blends with PMMA. The properties of allthe relaxation processes in connection with the crossover are similar, despitethe length-scales of the relaxation in these systems are widely different.

Coupling model analysis of interchain coupled chain dynamics of PEO in blends with PMMA