Jan Pavlíček

Vapour–Liquid Equilibria in the Poly(methyl methacrylate) + 2-Butanone System Containing Lower Concentrations of Solute at Normal or Reduced Pressures

Vapour–liquid equilibria (VLE) were determined in the poly(methyl methacrylate) + 2-butanone system under isothermal conditions at 333.15, 343.15, and 353.15 K using an improved all-glass microebulliometer with circulation of the liquid phase for the dynamic measurement of total pressure over liquid mixtures. The experimental data were correlated using the UNIQUAC model. The Entropic-FV and the GC-Flory equation of state models were applied to predict VLE, and the results were compared with the experimental data. Both predictive models proved of the same quality and capable of predicting VLE for the studied system.

Vapour-Liquid Equilibria in the Polystyrene + Toluene System at Higher Concentrations of Solvent

This paper represents a continuation of the series concerning experimental determination of vapour–liquid equilibria (VLE) in diluted polymer + solvent systems. In the previous papers we dealt with the polymeric flow improvers + toluene, hexane, chloroform1,2, poly(acrylic acid) + water3, poly(methyl methacrylate) + acetone3, and poly(methyl methacrylate) + 2-butanone4 systems. The aim of this study is to provide new – and always welcome – experimental data on vapour–liquid equilibria (VLE) in the polystyrene (PS) + toluene system, determined under isothermal conditions at 363.15, 373.15, and 383.15 K using ebulliometric techniques infrequently exploited for the investigation of polymer solutions. Moreover, the three prediction models were tested against the new experimental data.