We tested our parameters by modeling an amorphous PET material to study its structural and electronic properties under our additive and polarizable models. At room temperature, amorphous PET has a density of 1.34 g/mL. In our production runs, the Drude and CGenFF systems produced average densities of 1.218 ± 0.003 and 1.233 ± 0.002 g/mL, respectively (Table ). A complete density time series are presented in Figure . Although we observed a better in vacuo BHET dimer interaction energy using our Drude model relative to CGenFF, these results suggest a slight overestimation of Lennard-Jones repulsion for some of the ring atoms, the cumulative effects of which may be leading to an overall increase in intermolecular distances in condensed-phase applications. ). To build upon the well-modeled PET structural properties, future work should test our model in terms of mechanical properties such as elasticity, stress response, and pore formation under the influence of applied electric fields.