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Proton Conducting Membranes Based on Poly(Ionic Liquids) Having Phosphonium Counter‐Cations
Author(s) -
Isik Mehmet,
Porcarelli Luca,
Lago Nerea,
Zhu Haijin,
Forsyth Maria,
Mecerreyes David
Publication year - 2018
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201700627
Subject(s) - phosphonium , ionic liquid , thermogravimetric analysis , materials science , differential scanning calorimetry , polymer chemistry , membrane , sulfonic acid , polymer , conductive polymer , chemistry , organic chemistry , biochemistry , physics , thermodynamics , catalysis
Proton conducting polymeric membranes are highly searched in many different technologies ranging from energy to biosensing. Protic ionic liquids and their polymeric version represent a new family of proton conducting molecules with relatively facile synthesis and excellent properties. In this work, protic poly(ionic liquids) having the most popular phosphonium counter‐cations are presented for the first time. The synthesis is carried out through proton transfer reactions or through ion exchange reactions by using commercially available tertiary phosphines. Tributyl‐, trioctyl‐, and tricyclohexyl‐phosphine are selected to form the desired cations. Polystyrene sulfonic acid, poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid), and lithium poly[(4‐styrenesulfonyl) (trifluoromethanesulfonyl)imide] polymers are used to form the polymeric anions. The chemical structure of the protic poly(ionic liquids) is confirmed by spectroscopic characterizations such as Fourier transform infrared and nuclear magnetic resonance spectroscopies. Thermal properties of the polymer are characterized by means of differential scanning calorimetry and thermogravimetric analysis. Polymers exhibit good membrane forming ability as well as high ionic conductivities in the range of 10 −8 to 10 −3 S cm −1 from 30 to 90 °C.