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

Ushiki Ikuo

Yoshino Yuki

Hayashi Souta

Kihara Shin-ichi

Takishima Shigeki

The Journal of Supercritical Fluids

We 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.

Poly(ethylene-co-acrylic acid) (PEAA)

Carbon dioxide

Solubility

Sanchez−Lacombe equation of state

Diffusion coefficient

Free volume theory

eng

Elsevier

© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。

[ISSN] 0896-8446

[DOI] 10.1016/j.supflu.2019.104733

[DOI] https://doi.org/10.1016/j.supflu.2019.104733