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Mesoscopic molecular dynamics simulations are used to determine the largescale structure of several binary polymer mixtures of various chemicalarchitecture, concentration, and thermodynamic conditions. By implementing ananalytical formalism, which is based on the solution to the Ornstein-Zernikeequation, each polymer chain is mapped onto the level of a single soft colloid.From the appropriate closure relation, the effective, soft-core potentialbetween coarse-grained units is obtained and used as input to our mesoscalesimulations. The potential derived in this manner is analytical and explicitlyparameter dependent, making it general and transferable to numerous systems ofinterest. From computer simulations performed under various thermodynamicconditions the structure of the polymer mixture, through pair correlationfunctions, is determined over the entire miscible region of the phase diagram.In the athermal regime mesoscale simulations exhibit quantitative agreementwith united atom simulations. Furthermore, they also provide information atlarger scales than can be attained by united atom simulations and in thethermal regime approaching the phase transition.

Effective Soft-Core Potentials and Mesoscopic Simulations of Binary Polymer Mixtures