In this paper, a previous coarse-grain model [J. T. Padding and W. J. Briels, J. Chem. Phys.117, 925 (Year: 2002)]10.1063/1.1481859 to simulate melts of linear polymers has been adapted to simulate polymers with more complex hierarchies. Bond crossings between highly coarse-grained soft particles are prevented by applying an entanglement algorithm. We first test our method on a virtual branch point inside a linear chain to make sure it works effectively when linking two linear arms. Next, we apply our method to study the diffusive and rheological behaviors of a melt of three-armed stars. We find that the diffusive behavior of the three-armed star is very close to that of a linear polymer with the same molecular weight, while its rheological properties are close to those of a linear chain with molecular mass equal to that of the longest linear sub-chain in the star.
Liu, L., Padding, J. T., den Otter, W. K., & Briels, W. J. (2013). Coarse-grained simulations of moderately entangled star polyethylene melts. Journal of chemical physics, 138(24), . https://doi.org/10.1063/1.4811675