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Zhao, Y.; 吉村 公男; 猪谷 秀幸*; 山口 進*; 田中 裕久*; 小泉 智*; Szekely, N.*; Radulescu, A.*; Richter, D.*; 前川 康成
Soft Matter, 12(5), p.1567 - 1578, 2016/02
被引用回数：27 パーセンタイル：80.24(Chemistry, Physical)We investigated the interplay between morphology and properties of a new graft-type of anion exchange membranes (AEMs) containing 2-methylimidazolium groups by using contrast variation small angle neutron scattering (SANS) technique. These AEMs prepared by radiation-induced grafting of 2-methyl-1-vinylimidazole and styrene into poly(ethylene-co-tetrafluoroethylene) (ETFE) films, possessed both high alkaline durability and high conductivity. The SANS measurement reveals that these membranes are consisted of three phases: crystalline lamellar and crystallite domains originating from the pristine ETFE, which offer good mechanical properties, hydrophobic amorphous domains, which offer a matrix to create conducting regions, and interconnected hydrated domains, which are composed of the entire graft chains and water and play a key role to promote the conductivity.
前川 康成
no journal, ,
Radiation-induced grafting technique was applied to the development of proton- and anion-conducting electrolyte membranes (PEM and AEM) for hydrogen- and alkaline hydrated hydrazine-fuel cells. The graft-type PEM and AEM could solve the currently most concerned problems, conductivity and mechanical properties at low and high relative humidities (RH), respectively for a PEM and alkaline durability for a AEM. The hierarchical structures of ETFE-PEM and ETFE-AEM were investigated using small angle X-ray and neutron scattering (SAXS and SANS). The grafted ETFE membranes were characterized as being composed of conducting graft domains around ETFE lamellar crystals with a period of 20-30 nm and well-connected crystallite network domains with a d-range of 200-300 nm. The well-connected ion-channels around ETFE lamellar crystals and crystallite domains should be origin of high conductivity and mechanical properties of both graft-type PEM and AEM.
吉村 公男; 越川 博; 八巻 徹也; 猪谷 秀幸*; 山口 進*; 田中 裕久*; 前川 康成
no journal, ,
高エネルギー密度の水加ヒドラジンなどの液体燃料が使用可能なアルカリ形非白金燃料電池において、アニオン伝導電解質膜のアルカリ耐性の向上が求められている。本研究では、アルカリ分解反応の起点となるイミダゾリウム環の2位炭素をメチル基で保護するため、2-メチル-1-ビニルイミダゾールのグラフト重合により新規アニオン膜を作製した。得られたアニオン膜の60
Cにおける導電率は123mS cm
、含水率は110%、IECは1.80meq gとなり、燃料電池動作に十分な物性を有していた。耐アルカリ性を評価した結果、2位をメチル基で保護することで、80Cの1M KOH中での長期耐久性が大幅に向上したことから、イミダゾリウム環の2位炭素のメチル基保護が、開環分解反応を抑制し、アルカリ耐性を改善することがわかった。
