WEKO3
アイテム
Reverse relationships of water uptake and alkaline durability with hydrophilicity of imidazolium-based grafted anion-exchange membranes
https://repo.qst.go.jp/records/49517
https://repo.qst.go.jp/records/49517ae075c42-14de-4ee9-bf1e-5b8c37375281
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-01-29 | |||||
| タイトル | ||||||
| タイトル | Reverse relationships of water uptake and alkaline durability with hydrophilicity of imidazolium-based grafted anion-exchange membranes | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
吉村, 公男
× 吉村, 公男× ザオ, ユエ× 廣木, 章博× Kishiyama, Yoshihiro× Shishitani, Hideyuki× Yamaguchi, Susumu× Tanaka, Hirohisa× Koizumi, Satoshi× Houston, Judith× Radulescu, Aurel× Appavou, Marie-Sousai× Richter, Dieter× 前川, 康成× 吉村 公男× ザオ ユエ× 廣木 章博× 前川 康成 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We found unprecedented reverse relationships in anion-exchange membranes (AEMs) for Pt-free alkaline fuel cell systems, i.e., the increase in hydrophobicity increased water uptake and susceptibility to hydrolysis. AEMs with graft copolymers that composed of anion-conducting 2-methyl-N-vinylimidazolium (Im) and hydrophobic styrene (St) units were employed. We characterized two new structures in these AEMs using a small-angle neutron scattering with a contrast variation method. (1) The distribution of graft polymers in conducting (ion channel) or non-conducting (hydrophobic amorphous poly(ethylene-co-tetrafluoroethylene) (ETFE)) phase was evaluated in a quantitative manner. High fraction in conducting layer for AEMs having high grafting degrees was found using the proposed structural model of “conducting/non-conducting two-phase system.” (2) Assuming a hard-sphere fluid model, AEMs having high St contents and low alkaline durability possessed nanophase-separated water puddles having diameters of 3-4 nm. The AEM having a low St content and the best alkaline durability did not show evident nanophase separation. The above hierarchical structures elucidate the unexpected reverse relationships that the AEM having highly hydrophobic graft polymers was subjected to the morphological transition to give water puddles at nanoscale. The imidazolium groups that were located at the boundary between graft polymers and water puddles should be susceptible to hydrolysis. | |||||
| 書誌情報 |
Soft Matter 巻 14, 号 45, p. 9118-9131, 発行日 2018-12 |
|||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1744-683X | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1039/C8SM01650J | |||||
| 関連サイト | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | http://dx.doi.org/10.1039/C8SM01650J | |||||
| 関連名称 | http://dx.doi.org/10.1039/C8SM01650J | |||||
