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https://hdl.handle.net/10119/20021
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| Title: | Effects of Alkyl Side Chain Length on the Structural Organization and Proton Conductivity of Sulfonated Polyimide Thin Films |
| Authors: | Honbo, Tetsuya
Ono, Yutaro
Suetsugu, Kota
Hara, Mitsuo
Taborosi, Attila
Aoki, Kentaro
Nagano, Shusaku
Koyama, Michihisa
Nagao, Yuki |
| Keywords: | lyotropic liquid crystalline properties
aligned structure
proton dissociation
universal neural network potential
proton transport mechanisms |
| Issue Date: | 2024-10-21 |
| Publisher: | American Chemical Society |
| Magazine name: | ACS Applied Polymer Materials |
| Volume: | 6 |
| Number: | 21 |
| Start page: | 13217 |
| End page: | 13227 |
| DOI: | 10.1021/acsapm.4c02490 |
| Abstract: | This study investigates the impact of alkyl side chain length on structural organization and proton conductivity of sulfonated polyimide (SPI) thin films. SPIs with different alkyl sulfonated side chain lengths CX (X: number of carbon atoms at the side chain, X = 0, 3, 6 and 10) were synthesized and the relationship between molecular architecture and proton transport properties was investigated. In all SPIs, the polymer backbone oriented parallel to the substrate, and the lamellar structures were confirmed, with spacing increasing linearly with side chain length. Water uptake behavior and proton conductivity varied significantly, where C0 thin film exhibited the highest water uptake and proton conductivity at lower humidity. While, C3 thin film achieved higher conductivity under high humidity, reaching 1.8 × 10−1 S cm−1 at 298 K and 95% relative humidity (RH) and the activation energy of 0.18 eV at 90% RH. Conversely, extending the alkyl side chain length led to the insolubility in water in C10. As a result, a proton exchange membrane system with high chemical/water stability and high proton conductivity was constructed. These findings provide critical insights into designing advanced proton-conducting materials, optimizing their performance for fuel cells and other electrochemical devices. |
| Rights: | Tetsuya Honbo, Yutaro Ono, Kota Suetsugu, Mitsuo Hara, Attila Taborosi, Kentaro Aoki, Shusaku Nagano, Michihisa Koyama, and Yuki Nagao, ACS Applied Polymer Materials, 2024, 6, 21, 13217-13227. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Polymer Materials, copyright (c) American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsapm.4c02490. |
| URI: | https://hdl.handle.net/10119/20021 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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| M-NAGAO-Y-1010-3.pdf | | 1686Kb | Adobe PDF | View/Open |
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