APPLICATION OF THE GROUP-CONTRIBUTION LATTICE-FLUID EQUATION OF STATETO RANDOM COPOLYMER-SOLVENT SYSTEMS

A group-contribution lattice-fluid equation of state (GCLF-EOS), which is capable of predicting the equilibrium properties of polymer-solven t solutions, has been developed. Group contributions for the interacti on energy and reference volume have been developed, based only on the saturated vapor pressures and liquid densities of low molecular weight compounds. For a mixture, group contributions of the binary parameter have been developed from the binary vapor-liquid equilibria of low mo lecular weight compounds. The model can be applied to the prediction o f activity coefficients of solvents in random copolymers. The only inp ut required for the model is the structure of the molecules in terms o f their functional groups. No other pure component or mixture properti es of the polymer or solvent are needed.