The Impact of Alkyl Substituents in the Polycation Structure: Physicochemical and Gas Separation Properties of Poly(Ionic Liquids) Based on Butylimidazolium and Triethylammonium

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Abstract

The influence of the polycation structure on the physicochemical and gas separation properties of poly(ionic liquids) was investigated while maintaining the same set of counter anions (BF 4 – , PF 6 – , Tf 2 N – ). It was found that increasing the alkyl chain length and replacing the imidazolium cation with a triethylammonium one lead to changes in interionic interactions, a decrease in density and surface polarity, and an increase in the free volume of the polymer matrix. These structural modifications affect the gas transport properties of the membranes: samples containing the Tf 2 N – anion exhibit the highest CO 2 permeability values while maintaining high selectivity for CO 2 /CH 4 and CO 2 /N 2 gas pairs. The results demonstrate that a combined variation of the alkyl substituent in the polycation and the weakly coordinating anion allows for targeted tuning of the structure and gas separation performance of poly(ionic liquid)-based membranes, making them promising materials for CO 2 capture and separation applications.

About the authors

K. V. Otvagina

Lobachevsky State University of Nizhny Novgorod

Email: k.v.otvagina@gmail.com
Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

D. M. Zarubin

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

A. A. Golovacheva

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

D. N. Smirnova

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

D. I. Feshina

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

D. G. Fukina

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

O. V. Kazarina

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

A. N. Petukhov

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

A. V. Vorotyntsev

Lobachevsky State University of Nizhny Novgorod

Gagarina Avenue 23, Nizhny Novgorod, 603950, Russia

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