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- W2059388637 abstract "We use molecular dynamics simulations of the Kremer–Grest (KG) bead–spring model of polymer chains of length between 10 and 500, and a closely related analogue that allows for chain crossing, to clearly delineate the effects of entanglements on the length-scale-dependent chain relaxation in polymer melts. We analyze the resulting trajectories using the Rouse modes of the chains and find that entanglements strongly affect these modes. The relaxation rates of the chains show two limiting effective monomeric frictions, with the local modes experiencing much lower effective friction than the longer modes. The monomeric relaxation rates of longer modes vary approximately inversely with chain length due to kinetic confinement effects. The time-dependent relaxation of Rouse modes has a stretched exponential character with a minimum of stretching exponent in the vicinity of the entanglement chain length. None of these trends are found in models that allow for chain crossing. These facts, in combination, argue for the confined motion of chains for time scales between the entanglement time and their ultimate free diffusion." @default.
- W2059388637 created "2016-06-24" @default.
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- W2059388637 date "2014-09-15" @default.
- W2059388637 modified "2023-10-15" @default.
- W2059388637 title "Rouse Mode Analysis of Chain Relaxation in Homopolymer Melts" @default.
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- W2059388637 doi "https://doi.org/10.1021/ma500900b" @default.
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