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| Title: | Proton conductivity enhancement in oriented, sulfonated polyimide thin films |
| Authors: | Krishnan, Karthik
Iwatsuki, Hiroko
Hara, Mitsuo
Nagano, Shusaku
Nagao, Yuki |
| Keywords: | Proton conduction
Enhancement
Confined thin film
Polyimide
Organized structure |
| Issue Date: | 2014-03-27 |
| Publisher: | Royal Society of Chemistry |
| Magazine name: | Journal of Materials Chemistry A |
| Volume: | 2014 |
| Number: | 19 |
| Start page: | 6895 |
| End page: | 6903 |
| DOI: | 10.1039/C4TA00579A |
| Abstract: | Studies of proton transport in confined thin polymer electrolytes are essential for providing additional information regarding the structure-property relationships of such materials. Using a combination of proton transport measurements and structural characterization, we explored the effect of proton conductivity in sulfonated polyimide (SPI) under both bulk and nanostructured thin film systems. SPI film confined to a thickness of approximately 530 nm shows significant proton conductivity enhancement to a value of 2.6 × 10^<-1> S/cm (95% RH at 298 K), which is almost one order of magnitude more proton conductive than the bulk system (3.0 × 10^<-2> S/cm at 90% RH and 298 K). In thin film, the preferred chain packing along the in-plane direction can have considerable influence on the charge transport characteristics, which leads to the enhanced proton conductivity. The infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) and in situ grazing-incidence small-angle X-ray scattering (GISAXS) were used to investigate the direction of polymer orientation and the changes in the internal polymeric structure under various humidity conditions, respectively. Under high-humidity conditions, the strong interaction between the side-chain sulfonic acid groups and water molecules causes an abrupt change in the internal structure in bulk SPI. Such structural rearrangement results in a liquid-crystal-like ordered polymer structure. The RH dependent FTIR-ATR studies reveal that, the accumulation of large fraction of water molecules with stronger hydrogen bonding at high humidity region causes the huge deviation in the internal morphology of the bulk samples. |
| Rights: | Copyright (C) 2014 Royal Society of Chemistry. Karthik Krishnan, Hiroko Iwatsuki, Mitsuo Hara, Shusaku Nagano and Yuki Nagao, Journal of Materials Chemistry A, 2014(19), 2014, 6895-6903. http://dx.doi.org/10.1039/C4TA00579A - Reproduced by permission of The Royal Society of Chemistry |
| URI: | http://hdl.handle.net/10119/12610 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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