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. (C) 2013 Elsevier B.V. All rights reserved.