Fluids containing hard-chain molecules with attractive potential of variable range: Extension to mixtures and heteronuclear chain fluids

A new derived analytical perturbed equation of state for pure homonuclear hard-chain fluids with attractive potential of variable range is extended to homonuclear hard-chain fluid mixtures and fluids containing heteronuclear hard-chain molecules. The molecules modeled as chains of freely jointed tangent spheres that interact via an interchain site-site square-well or Yukawa potential. One-fluid mixing rules are used to approximate the average mixture structure and perturbation parameters for mixtures and then, the new equation of state for mixtures is extended to heteronuclear hard-chain fluids. To test the extended equation of state, we compare the compressibility factor for various mixtures and heteronuclear hard-chain fluids such as blocky, alternatingly and randomly, with molecular dynamic simulation data and well known equations of state.