08-08E

An extension of the dimer version of Wertheim's thermodynamic perturbation theory is proposed and used to treat polydisperse mixture of the hard-sphere Yukawa chain fluid with chain length polydispersity. The structure and thermodynamic properties of the reference system of Yukawa hard-sphere dimers, are described using polymer mean spherical approximation. Analytical expressions for the Helmholtz free energy, chemical potential and pressure in terms of the two chain length distribution function moments are derived. Full liquid-gas phase diagram, including critical binodal, cloud and shadow curves and distribution functions of the coexisting phases were calculated.