A modified generalized lattice-fluid (MGLF) model was developed to pre
dict and describe phase behaviours of polymer solutions under high pre
ssure condition. To consider the specific interaction between pure com
ponents, a new parameter, kappa(11), was introduced into the generaliz
ed lattice-fluid (GLF) model. The proposed model was compared with a p
hase diagram predicted by the GLF model and experimental data for poly
mer solution systems (polystyrene/diethylether and polystyrene/acetone
) showing lower critical solution temperature (LCST) at various pressu
res. The MGLF model predicted remarkably well the spinodal curve of a
given polymer/solvent system. (C) 1998 Elsevier Science Ltd. All right
s reserved.