Effect of the polar-nonpolar liquid mixtures on pervaporative behaviour of perfluorinated sulfonic membranes in lithium form

Edyta Rynkowska, Joanna Kujawa, Corinne Chappey, Kateryna Fatyeyeva, Larisa Karpenko-Jereb, Anne-Marie Kelterer, Stefan Marais, Wojciech Kujawski

Research output: Contribution to journalArticle

Abstract

Two ion-exchangemembranespossessingperfluorinated backbone and sulfonic groups(i.e.Nafions 120 and IonClad™ R4010 )with lithium(I) counter-ions were investigated.The interactions between solvents
of different polarity and the ion-exchange membranes with various morphologies were taken into account in order to better understand solvation and dissociation phenomena o fthe ion-pairs.
Pervaporation of polar (i.e.water,methanol)–nonpolar (i.e.methylacetate, dimethyl carbonate) liquid
mixtureswas carried out. It was revealed that the increase of the polar component concentration above
2 wt% in the feed mixture leads to dissociation of ion-pairs in Nafion membrane, which is reflected by the rapid increase of the polar component partial flux. In the case of IonClad membrane the dissociation of the ion-pairs during pervaporation was observed only when water was a polar feed component. The dissociation of ion-pairs was also evidenced in infrared study by observing the shift of symmetric stretching vibrations(νs) band sofsulfonic groups to the lower wave numbers, compared to the membrane in the dry state. The symmetric stretching vibrations(νs) bands of the dry Nafion membrane and
membrane solvated with water and methanol were equal to 1071cm^-1, 1058cm^-1, and1054cm^-1,
respectively. In the case of IonClad membrane the symmetric stretching vibration(νs) bands changed in
contact with water from1047cm^-1 (dry membrane) to1037cm^-1. The dissociation of the ion-pairs did
not occur in IonClad membrane equilibrated with methanol, which is also consistent with the result
obtained during pervaporation.
Original languageEnglish
Pages (from-to)313-327
Number of pages15
JournalJournal of membrane science
Volume58
DOIs
Publication statusPublished - 6 Jul 2016

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