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Title: A comparative study of coarse-graining methods for polymeric fluids: Mori-Zwanzig vs. iterative Boltzmann inversion vs. stochastic parametric optimization

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4959121· OSTI ID:1356514

We construct effective coarse-grained (CG) models for polymeric fluids by employing two coarse-graining strategies. The first one is a forward-coarse-graining procedure by the Mori-Zwanzig (MZ) projection while the other one applies a reverse-coarse-graining procedure, such as the iterative Boltzmann inversion (IBI) and the stochastic parametric optimization (SPO). More specifically, we perform molecular dynamics (MD) simulations of star polymer melts to provide the atomistic fields to be coarse-grained. Each molecule of star polymer with internal degrees of freedom is coarsened into a single CG particle and the effective interactions between CG particles can be either evaluated directly from microscopic dynamics based on the MZ formalism, or obtained by the reverse methods, i.e., IBI and SPO. The forward procedure has no free parameters to tune and recovers the MD system faithfully. For the reverse procedure, we find that the parameters in CG models are not interchangeable. If the free parameters are properly selected, the reverse CG procedure also yields an effective potential. Furthermore, we explain how an aggressive coarse-graining procedure introduces many-body effect, which makes the pairwise potential invalid for the same system at densities away from the training point. From this work, general guidelines for coarse-graining of polymeric fluids can be drawn.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC05-76RL01830; W911NF-12-2-0023; AC02-06CH11357; AC05-00OR22725
OSTI ID:
1356514
Alternate ID(s):
OSTI ID: 1272642
Report Number(s):
PNNL-SA-116567; KJ0401000
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 4; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Force‐field parametrization based on radial and energy distribution functions journal July 2019
A note on hydrodynamics from dissipative particle dynamics journal December 2017
Implicit-solvent coarse-grained modeling for polymer solutions via Mori-Zwanzig formalism journal January 2019
Multi-scale modeling of the polymer–filler interaction journal January 2020
Computing the non-Markovian coarse-grained interactions derived from the Mori–Zwanzig formalism in molecular systems: Application to polymer melts journal January 2017
Nature of intrinsic uncertainties in equilibrium molecular dynamics estimation of shear viscosity for simple and complex fluids journal July 2018
Development of a coarse-grain model for the description of the metal oxide-polymer interface from a bottom-up approach journal August 2019
Static structure of sodium polystyrene sulfonate solutions obtained through a coarse-grained model journal May 2018
Force-sampling methods for density distributions as instances of mapped averaging journal January 2019
Nature of Intrinsic Uncertainties in Equilibrium Molecular Dynamics Estimation of Shear Viscosity for Simple and Complex Fluids text January 2018