| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2023-06-30 |
| タイトル |
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タイトル |
Unique Structural Characteristics of Graft-Type Proton-Exchange Membranes using SANS Partial Scattering Function Analysis |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Yue Zhao
Yoshimura Kimio
Sawada Shinichi
Motegi Toshinori
Hiroki Akihiro
Aurel Radulescu
Maekawa Yasunari
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
The partial scattering function analysis was applied to determine the exact structure of radiation-grafted proton-exchange membranes, made of poly(styrenesulfonic acid)-grafted poly(ethylene-co-tetrafluoroethylene) (ETFE-g-PSSA). Hydrated ETFE-g-PSSA membranes were treated as a three-component system comprising ETFE base polymer (BP), PSSA graft polymer (GP), and absorbed water. On a large length scale, polymer grains with an approximate radius of gyration (Rg) of 150 nm and a mass fractal structure with a dimension of 2.4 were observed. These grains were formed by the aggregation of phase-separated GP domains in the BP matrix. Each individual GP domain has an average Rg of 9.5 nm and is composed of homogeneously distributed GP and water nanodomains that form a bicontinuous-like local structure with a mean separation distance of 2 nm. These structures were strongly supported by the first finding that PSSA GP and water interact attractively and repulsively in q-regions lower and higher than 2 nm^-1 (i.e., ~3 nm), respectively. The repulsion between GP and water at a molecular length level of <3 nm results in a lower hydration number and hence poorer conductivity at low relative humidity when compared to NafionR. The results of this study provided a mechanistic insight into membrane conductivity and structure correlations. |
| 書誌情報 |
Macromolecules
巻 55,
号 16,
p. 7100-7109,
発行日 2022-08
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| 出版者 |
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出版者 |
ACS Publications |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1520-5835 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1021/acs.macromol.2c00333 |
