Measurement and modeling of solubilities and diffusion coefficients of carbon dioxide in poly(ethylene-co-acrylic acid)

Publication date: Available online 20 December 2019Source: The Journal of Supercritical FluidsAuthor(s): Ikuo Ushiki, Yuki Yoshino, Souta Hayashi, Shin-ichi Kihara, Shigeki TakishimaAbstractWe measured and modeled the solubilities and diffusion coefficients of carbon dioxide (CO2) in poly(ethylene-co-acrylic acid) (PEAA) over temperatures of 373―473 K and pressures of up to 20 MPa. The measured solubilities of CO2 in PEAA obeyed Henry’s law and decreased with an increase in the acrylic acid content of the copolymer. The Sanchez-Lacombe equation of state could be applied to correlate the measured solubilities. The temperature dependence of the CO2 solubilities in PEAA was found to be similar to that in polyethylene with analysis using Henry’s law. Further, the gas solubility and acrylic acid content were the influential factors for determining the diffusivity of CO2, which could be modeled based on the free volume theory.Graphical abstract

Source: The Journal of Supercritical Fluids - December 21, 2019 Category: Chemistry Source Type: research