Vapour–liquid equilibria in the polymer + solvent system containing lower concentrations of solute at normal or reduced pressures

Vapour–liquid equilibria have been determined in the polymer + solvent systems, namely the poly(acrylic acid) + water, and poly(methyl methacrylate) + acetone system. Each system has been measured at three isothermal conditions. An all-glass microebulliometer with circulation of the liquid phase was used for dynamic measurements of total pressure over liquid mixtures. The determined data were correlated with the UNIQUAC equation.