2017 Fiscal Year Final Research Report
Development of Analytical Techniques for Studying the Structure and Property of a Polymer Influenced by Minute Water Molecules Involved in a Polymer Thin Film
| Project/Area Number |
26810075
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Analytical chemistry
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Research Collaborator |
Hasegawa Takeshi 京都大学, 化学研究所, 教授
Wakai Chihiro 京都大学, 化学研究所, 助教
Katsumoto Yukiteru 福岡大学, 理学部, 准教授
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Keywords | ナフィオン膜 / 燃料電池 / 吸着水 / フッ素化学 / 高分子 / 赤外分光法 / ラマン分光法 |
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| Outline of Final Research Achievements |
In the research project, water molecules involved in a polymer thin film were investigated. A notable research result is about Nafion, which is used as a representative proton exchange membrane.
Thus far, only two kinds of water about a sulfonic acid (SA) group have been known, i.e., the hydration water and exterior bulky water. To understand the hydration state of water on the SA group, 1H NMR spectra were analyzed, and a new third water species was found, which was also found to be significantly restricted in motion.
This motion-restricted water was further studied by the IR spectral ‘variation’ in detail with an aid of quantum calculation by changing the number of hydration water molecules. As a result, the newly found “third water” was revealed to have a H-bonded complex with a unique ring-shape on two sites of the SA group, which explains the motion restriction.
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| Free Research Field |
分析化学
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