Polymer-solvent demixing under tension. Isotope and pressure effects on liquid-liquid transitions,VII. Propionitrile–polystyrene solutions at negative pressure

Liquid-liquid demixing in propionitrile-polystyrene solutions has been observed (?2 < P/MPa < 4) using a Berthelot tube technique. The experimental isopleths join smoothly to ones gathered at positive pressure by another technique. The equation of state used to describe the transitions thus appears to be valid across the entire liquid range. © 1994 John Wiley & Sons, Inc.