  Most of the existing classical CO$_2$ models fail to reproduce some or many
experimental properties such as surface tension, vapor pressure, density and
dielectric constant at difference thermodynamic conditions. Therfore, it is
proposed a new computational model to capture better structural, dynamical and
thermodynamic properties for CO$_2$ . By scaling the Lennard Jones parameters
and point charges; three target properties, static dielectric constant, surface
tension and density, were used to fit actual experimental data. Moreover, by
constructing a flexible model, effects of polarization might be included by
variations of the dipole moment. Several tests were carried out in terms of the
vapour-liquid equilibria, surface tensions and saturated pressures showing good
agreement with experiments. Dynamical properties were also studied, such as
diffusion coefficients and viscosities at different pressures, and good trends
were obtained with experimental data.
