Prediction of solubility for solvent/polymer mixture with UNIFAC-FV and GCLF-EOS model

Polymer solution thermodynamic models, uniquac functional - group activity coefficient and free volume (UNIFAC - FV),and group contribution lattice fl uid equation - of - state (GCLF - EOS) model, were evaluated both theoretic ally and experimentally, by investigating the effect of excess cohesive ene rgy and excess volume on polymer solution phase behavior prediction for aro matic solvent mixing with poly (acrylate). Using a quartz spring method, th is study measured sorption curve of benzene, toluene, and ethylbenzene in p oly(methyl acrylate) (PMA), poly(n - butyl acrylate)(PBA), and poly(lauryl acrylate)(PLA) at 25 degreesC. GCLF - EOS model has the nature of equation - of - state, which enables accurate prediction of excess volume in sorptio n process, and provides good agreement of calculation results with the expe riments.