Liquid–liquid equilibria of polymer solutions with oriented interactions

The oriented interactions cause the complex of the phase behavior of polymer solutions. All types of phase diagrams such as UCST, LCST, miscibility-loop and hour-glass shaped phase diagrams are displayed in this paper. We extend our previously developed model to these real complex systems. Combined with the double lattice model, we express the exchange energy as a dependence on the temperature to take into account the effects of the oriented interactions. It is found that our model can describe all these complex phase behavior very well.