Comment on “Unified explanation of the anomalous dynamic properties of highly asymmetric polymer blends” [J. Chem. Phys. 138, 054903 (2013)]

摘要: In a recent paper by Ngai and Capaccioli ["Unified explanation of the anomalous dynamic properties highly asymmetric polymer blends," J. Chem. Phys. 138, 054903 (2013)] authors claimed that so-called coupling model (CM) provides unified all dynamical anomalies have been reported for dynamically blends over last ten years. Approximately half is devoted to chain-dynamic involving un-entangled polymers. According authors, application CM these results based on existence crossover at time t(c) ≈ 1-2 ns magnitudes describing chain-dynamics. such supported neutron scattering MD-simulation results, corresponding blend poly(methyl methacrylate)/poly(ethylene oxide), Niedzwiedz et al. [Phys. Rev. Lett. 98, 168301 (2007)] Brodeck [Macromolecules 43, 3036 (2010)], respectively. Being one two papers, I will demonstrate here there no evidence supporting in data papers.