A new modified Wilson equation for the calculation of vapor-liquid equilibrium of aqueous polymer solutions

作者：Xu X; Madeira PP; Teixeira JA; Macedo EA^*

来源：Fluid Phase Equilibria, 2003, 213(1-2): 53-63.

DOI：10.1016/S0378-3812(03)00185-7

• model
• activity
• local composition
• Wilson
• polymer solutions
• vapor-liquid equilibrium
• excess Gibbs energy
• aqueous two-phase systems

A local composition model based on the lattice theory and two-fluid theory, considering the excess heat capacity, which is a modified Wilson equation, is developed for the excess Gibbs energy of aqueous polymer solutions. The model represents a synergistic combination of the excess entropy for mixing molecules of different sizes and the temperature dependent residual contribution, which combines the attractive interactions between solvent molecules and the segments with the contribution of the excess heat capacity. The results of the extrapolation with respect to molecular weight of phase equilibrium in aqueous polymer solutions with this model are very satisfactory, with only two adjustable parameters.

• 出版日期2003-10-15