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Insights into the Carbon Dioxide Separation Performance of Bis(trifluoromethylsulfonyl)imide‐based Plastic Crystal Composite Membranes with Fluorinated Polar Polymers

journal contribution
posted on 2023-12-10, 23:51 authored by Fernando Ramos‐Saz, Colin SM Kang, Luke A O'Dell, Maria ForsythMaria Forsyth, Jenny PringleJenny Pringle
AbstractMembrane‐based gas separation technologies are one solution towards mitigating global emissions of CO2. New membrane materials with improved separation performance are still highly sought after. Composite membranes based on organic ionic plastic crystals (OIPCs) have shown preferential interaction for CO2 over N2, leading in some cases to competitive CO2/N2 selectivities. However, these ionic materials have been scarcely studied in the field of gas separation. Here, OIPCs based on the bis(trifluoromethylsulfonyl)imide ([TFSI]−) anion were investigated for use as gas separation membranes for the first time. The effect of the polymer type was also investigated, through the comparison of poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride)‐hexafluoropropylene (PVDF‐HFP) OIPC membranes. A strong temperature dependence of the gas separation performance was found, particularly in the N‐methyl‐N‐ethylpyrrolidinium‐based composites where the material undergoes a solid‐solid phase transition within the testing temperature range. The polymer type was noted to induce a strong effect on the structure of the composites, as well as affecting the gas and ionic transport. Thus, this research provides insights on the influence of the [TFSI]− anion on the structure and separation properties of OIPC‐based composites, and new information towards the development of novel OIPC‐based membranes with enhanced gas separation performance.

History

Journal

ChemSusChem

Article number

e202301314

Pagination

e202301314-

Location

Germany

ISSN

1864-5631

eISSN

1864-564X

Language

en

Publisher

Wiley