Polymer solution thermodynamic models, uniquac functional-group activity coefficient and free volume (UNIFAC-FV), and group contribution lattice fluid equation - ofstate (GCLF-EOS) model, were evaluated both theoretically and experimentally, by investigating the effect of excess cohesive energy and excess volume on polymer solution phase behavior prediction for aromatic solvent mixing with poly(acrylate). Using a quartz spring method, this study measured sorption curve of benzene, toluene, and ethylbenzene in poly(methyl acrylate)(PMA), poly(n-butyl acrylate)(PBA), and poly(lauryl acrylate) (PLA) at 25℃. GCLF-EOS model has the nature of equation-of-state, which enables accurate prediction of excess volume in sorption process, and provides good agreemnet of calculation results with the experiments .

Key words: COHESIVE ENERGY, POLYACRYLATE, ADSORPTION, PHASE EQUILIBRIUM, SOLVENT EFFECT, POLYMER SOLUTION