HTPolyNet: A general system generator for all-atom molecular simulations of amorphous crosslinked polymers

Generation of realistic all-atom configurations of crosslinked polymer systems is a difficult task which so far has mainly been tackled using either closed-source software or bespoke, highly user-intensive efforts. In this work, we present a robust, open-source Python package HTPolyNet designed to generate polymerized and/or crosslinked all-atom systems using only input monomer structures and a description of the polymerization chemistry. HTPolyNet works with the popular GROMACS molecular dynamics package and the General Amber Force Field. In addition to describing the structure and usage of HTPolyNet we also demonstrate its application to two distinct systems: a vinyl-ester based resin and an epoxy-amine resin, both of which form dense, amorphous network systems.