Synthesis of imidazolium-based poly(ionic liquid)s and their application to ion-exchange materials
- PDF / 1,193,108 Bytes
- 16 Pages / 439.37 x 666.142 pts Page_size
- 31 Downloads / 166 Views
Synthesis of imidazolium‑based poly(ionic liquid)s and their application to ion‑exchange materials Kozo Matsumoto1 · Takuya Yano1 · Shota Date1 · Yuka Odahara1 · Shingo Narimura1 Received: 15 February 2020 / Revised: 24 August 2020 / Accepted: 18 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Linear and networked poly(ionic liquid)s, which were composed of polyoxetanes and imidazolium groups, were synthesized by cationic polymerization of mono- and di- functional oxetanyl monomers, and the properties of the obtained polymers were investigated. The monofunctional monomer, 3-(3-ethyl-3-oxetanylmethyl)-1,2-dimethylimidazolium bis(trifluoromethanesulfonyl)imide (OXDMImTFSI), was prepared from the reaction of 3-ethyl-3-oxetanylmethyl chloride with 1,2-dimethylimidazole followed by exchanging the chloride to bis(trifluonomethanesulfonyl)imide (TFSI). The difunctional monomer, 1,3-di(3-ethyl-3-oxetanylmethyl)-2-methylimidazolium bis(trifluoromethanesulfonyl)imide (DOXMImTFSI), was prepared from the reaction of 3-ethyl-3-oxetanylmethyl chloride with 2-methylimidazole and successive ion-exchange of chloride to TFSI. OXDMImTFSI was polymerized by addition of a catalytic amount of B F3 diethyl ether complex. The obtained linear polyOXDMImTFSI showed good stability toward heat and basic conditions. Networked polymer films were prepared by homo/co-polymerization of DOXMImTFSI or DOXMImTFSI/OXDMImTFSI liquid layers using the thermally latent cationic initiator, (1-naphthylmethyl) methyl p-hydroxyphenyl sulfonium hexafluoroantimonate (SI-60). The obtained films showed good ion-exchange ability between TFSI, Cl, and OH anions.
Introduction Poly(ionic liquid)s, which are prepared via polymerization of ionic liquids, have attracted many researchers due to their unique properties such as ionic conductivity, aqueous solubility, thermodynamic stability, and electrochemical/chemical durability [1–4]. Their applications have widely been investigated in the fields of * Kozo Matsumoto [email protected] 1
Department of Biological and Environmental Chemistry, Kindai University, 11‑6 Kayanomori, Iizuka, Fukuoka Prefecture 820‑8555, Japan
13
Vol.:(0123456789)
Polymer Bulletin
electrochemical energy devices, [5–8] stimuli-responsive materials, [8, 9] catalysts, [10, 11] sensors [12, 13], absorbents, [14, 15] separation technology, [16, 17] and so on. We previously reported the synthesis of a polyether having imidazolium pendant groups by cationic polymerization of an ionic liquid oxetane monomer having an imidazolium group, 1-ethyl-3-(3-ethyl-3-oxetanylmethyl)imidazolium bis(trifluoromethanesulfonyl)imide (OXImTFSI) [18]. This polymer had high thermal stability and a low glass transition temperature. This research prompted us to further investigate poly(ionic liquid)s useful for anion-exchange materials, because polyethers are thermally and electrically stable in general [19–21], they exhibit high chemical stability particularly under alkaline conditions, and the imidazolium group
Data Loading...
