Some Thermodynamic Properties of the Binary Systems of Toluene with Butyl Methacrylate, Allyl Methacrylate, Methacrylic Acid and Vinyl Acetate at 20, 30 and 40 °C

Densities of the binary systems of toluene with butyl methacrylate, allyl methacrylate, methacrylic acid, and vinyl acetate have been measured as a function of composition at 20, 30 and 40 °C at atmospheric pressure, using an Anton Paar DMA 5000 oscillating U-tube densimeter. The excess molar volumes are negative for the system toluene + butyl methacrylate and positive for the three other binaries, and become more so as the temperature increases from 20 to 40 °C. The system toluene + allyl methacrylate presents near ideal behavior. The apparent volumes were used to calculate values of the partial excess molar volumes at infinite dilution. The excess coefficient of thermal expansion is positive for the four binary systems. The calculated excess molar volumes were correlated with the Redlich–Kister equation and with a series of Legendre polynomials. An explanation of the results is given based by the FT-IR (ATR) and 13C NMR spectra of equimolar mixtures of the different systems.