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1. K. L. Ngai and S. Capaccioli, J. Chem. Phys. 138, 054903 (2013).
2. M. Niedzwiedz, A. Wischnewski, M. Monkenbusch, D. Richter, A.-C. Genix, A. Arbe, J. Colmenero, M. Strauch, and E. Straube, Phys. Rev. Lett. 98, 168301 (2007).
3. M. Brodeck, F. Alvarez, A. J. Moreno, J. Colmenero, and D. Richter, Macromolecules 43, 3036 (2010).
4. S. Arrese-Igor, A. Alegría, A. J. Moreno, and J. Colmenero, Soft Matter 8, 3739 (2012).

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In a recent paper by Ngai and Capaccioli [“Unified explanation of the anomalous dynamic properties of highly asymmetric polymer blends,” J. Chem. Phys.138, 054903 (Year: 2013)10.1063/1.4789585] the authors claimed that the so-called coupling model (CM) provides a unified explanation of all dynamical anomalies that have been reported for dynamically asymmetric blends over last ten years. Approximately half of the paper is devoted to chain-dynamic properties involving un-entangled polymers. According to the authors, the application of the CM to these results is based on the existence of a crossover at a time ≈ 1–2 ns of the magnitudes describing chain-dynamics. Ngai and Capaccioli claimed that the existence of such a crossover is supported by the neutron scattering and MD-simulation results, corresponding to the blend poly(methyl methacrylate)/poly(ethylene oxide), by Niedzwiedz et al. [Phys. Rev. Lett.98, 168301 (Year: 2007)10.1103/PhysRevLett.98.168301] and Brodeck et al. [Macromolecules43, 3036 (Year: 2010)10.1021/ma902820a], respectively. Being one of the authors of these two papers, I will demonstrate here that there is no evidence supporting such a crossover in the data reported in these papers.


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