Abstract
Here, we report on a new family of columnar nanostructured polymer films forming protic nanochannels that exhibit good ionic conductivities in the order of 10−4–10−3 S cm−1 at ambient temperature. These polymer films were obtained by the in situ photopolymerization of lyotropic columnar liquid crystals, consisting of a polymerizable taper-shaped zwitterionic compound and a protic ionic liquid (imidazolium bis(trifluoromethylsulfonyl)imide), in the presence of 15 wt% water. The composition of the protic ionic liquid in the mixture was changed from 40 to 60 mol%. The ionic conductivities were measured by an alternating current impedance method. The ionic conductivity increased with the increase of the protic ionic liquid. The conductivities of columnar nanostructured polymer films were about 2–3 orders of magnitude higher than those of amorphous polymer films prepared by photopolymerization of the corresponding monomers in an isotropic liquid state. The formation of nanochannels in the polymer matrices significantly enhanced the ion conduction. The present two-component lyotropic liquid-crystalline self-assembly followed by photopolymerization is a promising approach to the development of high ion-conductive polymer membranes.
Highlights
Nanostructured ionic liquid-crystalline (LC) assemblies are currently attracting widespread interest for applications in batteries and separation membranes [1,2,3,4,5,6,7,8]
We previously reported on the development of proton transporting columnar and bicontinuous cubic LC assemblies with one-dimensionally anisotropic channels and three-dimensionally interconnected channels, respectively [10,11]
We report on a new family of proton-conductive columnar LC polymer films based on room-temperature lyotropic columnar LC monomers composed of a zwitterionic molecule 1 having three acrylate groups at the extremity of the alkyl chains, protic ionic liquid 2, and water (Figure 2)
Summary
Nanostructured ionic liquid-crystalline (LC) assemblies are currently attracting widespread interest for applications in batteries and separation membranes [1,2,3,4,5,6,7,8]. We assume that the self-assembly of bis(trifluoromethylsulfonyl)imide acid (HTFSI) were reported to form ambient temperature ionic protic ionic liquids containing TFSI anion and taper-shaped polymerizable zwitterionic molecules liquids by Yoshizawa and Ohno [12]. This concept was further extended to the design of high into columnar. We report on a new family of proton-conductive columnar LC polymer films based on room-temperature lyotropic columnar LC monomers composed of a zwitterionic molecule 1 having three acrylate groups at the extremity of the alkyl chains, protic ionic liquid 2, and water (Figure 2). We report on a new family of proton-conductive columnar LC polymer films based on room-temperature lyotropic columnar LC monomers composed of a zwitterionic molecule 1 having threeFigure acrylate groups at illustration the extremity of the alkyl chains, protic ionic
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