2021
DOI: 10.1021/acs.macromol.0c02583
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Dynamics and Rheology of Polymer Melts via Hierarchical Atomistic, Coarse-Grained, and Slip-Spring Simulations

Abstract: A hierarchical (triple scale) simulation methodology is presented for the prediction of the dynamical and rheological properties of high molecular-weight entangled polymer melts. The methodology consists of atomistic, moderately coarse-grained (mCG), and highly coarse-grained slip-spring (SLSP) simulations. At the mCG level, a few chemically bonded atoms are lumped into one coarse-grained bead. At this level, the chemical identity of the underlying atomistic system and the interchain topological constraints (e… Show more

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Cited by 50 publications
(103 citation statements)
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“…These chains exhibit Rouse-like dynamics with a characteristic MSD ∼ t 0.5 behavior up to t ≈ 10 4 ps, where a slightly negative slope can be observed for segments in the middle of the film (labels fifth and higher). A negative slope in this representation indicates the presence of entanglements [68], as also shown in our recent study of bulk PB [69].…”
Section: Dynamics At the Interfacesupporting
confidence: 80%
“…These chains exhibit Rouse-like dynamics with a characteristic MSD ∼ t 0.5 behavior up to t ≈ 10 4 ps, where a slightly negative slope can be observed for segments in the middle of the film (labels fifth and higher). A negative slope in this representation indicates the presence of entanglements [68], as also shown in our recent study of bulk PB [69].…”
Section: Dynamics At the Interfacesupporting
confidence: 80%
“…We note that these parameters could be determined from atomistic and coarse-grained molecular simulations, as attempted earlier [43][44][45][46][47][48]. However, we did not employ such a bottom-up approach due to practical difficulties for atomistic simulations of PPC.…”
Section: Model and Simulationsmentioning
confidence: 99%
“…Recently, we introduced a hierarchical triple-scale scheme to model the dynamic properties of cis-1,4 polybutadiene melts over a broad spatiotemporal scale. 68 The systematic bottom-up parameterization of the SLSP representation based on the dynamics of the end-to-end vector in a moderate CG model (employed as a bridging resolution between the SLSP simulations and atomistic detail) allowed us to explore viscoelastic properties of PB up to ≈108,000 g/mol. In the present work, we combine the three different levels of modeling, namely, a united-atom (UA) model, a CG model, and an even more highly CG SLSP model, to explore the conformational properties and dynamics of PI over a broad range of M extending to ≈204,000 g/mol.…”
Section: ■ Introductionmentioning
confidence: 99%