Abstract
In our previous work, a new lattice-fluid equation of state (LF-EoS) was developed and successfully applied to normal fluid systems and ionic liquid systems. In this work, this LF-EoS is further extended to describe thermodynamic properties of polymer systems. First, the model parameters for polymers were determined by fitting experimental pVT data of polymers over a wide temperature and pressure range. Then, the LF-EoS was applied for calculating vapor−liquid equilibrium (VLE) of polymer−solvent systems using one adjustable binary parameter κ12. The solubility of gas in polymer can be calculated up to a high pressure. Moreover, a new parameter Cr was introduced to describe the effect of composition of mixtures on chain length parameter r, and several typical liquid−liquid equilibrium behaviors of polymer solutions can be successfully reproduced.
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