Volumetric properties of carbon dioxide + acrylic acid binary in the context of supercritical precipitation polymerization

MATIAS MENOSSI; SIMON HARRISON; JUAN MANUEL MILANESIO; MIRIAM STRUMIA; SEVERINE CAMY; MATHIAS DESTARAC

JOURNAL OF SUPERCRITICAL FLUIDS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2020 vol. 160 p. 1 - 11

0896-8446

Acrylic acid (AA) is a monomer that can be polymerized by precipitation in different solvents. Carbon dioxide (CO2) is a low dielectric constant compound and a weak Lewis acid with a significant quadrupole moment. These physicochemical characteristics make possible to solubilize some polar compounds in CO2 depending on temperature and pressure. In this work, we report pressure vs volume pseudo-continuous curves at constant temperature for CO2 + AA binary mixture. They were determined in a fully computerized variable-volume high-pressure view cell capable of monitoring the position of the piston. The experimental data is simultaneously isoplethic and isothermal and it covers a wide range of pressures (0.1 - 25 MPa). Using this raw experimental data, other properties were determined such as liquid-vapor phase boundaries, density and excess volumes. The temperature range was 313.15 to 363.15 K and the mole fraction of AA in the mixture was increased from 0.044 to 0.594