LIQUID-LIQUID EQUILIBRIA OF POLYMER-SOLUTIONS - A CLOSED MISCIBILITY LOOP PHASE-BEHAVIOR

In the phase behavior of binary polymer/solvent mixtures, a lower crit ical solution temperature (LCST) and hour-glass shaped and closed misc ibility loop phase behavior are encountered. The closed miscibility lo op phase behavior may be mainly due to highly oriented interactions su ch as hydrogen bonding. The purpose of this study is to describe close d miscibility loop phase behavior in the liquid-liquid equilibria of p olymer solutions. To consider highly oriented interactions (or specifi c interactions), we employed a secondary lattice concept as a perturba tion term.