Coarse-Grained Modeling of Polystyrene in Various Environments by Iterative Boltzmann Inversion

We have developed mesoscale models for polystyrene (PS) oligomers in various environments following the Iterative Boltzmann Inversion Technique. Bond, bending angle, torsion angle distributions, and radial distribution functions between PS monomers show that local structures were reproduced very well, while a small discrepancy remained in the reproduction of global structures (radii of gyration and end-to-end distances), which is probably due to end effects. Speedup in polymer dynamics with each model was monitored by scaling factors calculated based on characteristic relaxation times of the end monomers as well as diffusivities of the chains. Results show that coarse-graining is most successful for the highest concentration system (melt) and least for the lowest concentration (dilute solution) due to the stronger slowdown of diffusive and rotational dynamics in atomistic simulations with concentration. The speedup in the confined solution system was found to be greater than in the unconfined solution sys...

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