CONSTRUCTION OF TERNARY PHASE-DIAGRAMS IN NONSOLVENT SOLVENT/PMMA SYSTEMS/

In this work, the ternary phase diagrams in three nonsolvent/solvent/P MMA systems (n-hexane/n-butyl acetate/PMMA, water/acetone/PMMA, and n- hexane/acetone/PMMA) were constructed by theoretical calculation and e xperimental measurement. Binodal curves were calculated by using the F lory-Huggins theory for three-component systems and measured by titrat ing the PMMA solution with nonsolvent until the onset of turbidity. By using concentration-dependent nonsolvent/solvent and solvent/PMMA int eraction parameters and constant nonsolvent/PMMA interaction parameter s, good agreement has been obtained between the calculation and the me asurement. The values of nonsolvent/solvent interaction parameters wer e taken from the literature sources, and the values of solvent/PMMA an d nonsolvent/PMMA interaction parameters were measured by vapor sorpti on and swelling equilibrium, respectively. (C) 1998 John Wiley & Sons, Inc.