成果報告書詳細
管理番号20150000000190
タイトル*平成26年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 水素ステーションの高圧水素用ホースとシールシステムに関する研究開発(化学物質評価研究機構)
公開日2015/12/19
報告書年度2014 - 2014
委託先名一般財団法人化学物質評価研究機構
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title: Research and Development of Technology for Hydrogen Utilization/ Research and Development of Low-cost Equipment and System for Fuel Cell Vehicles and Hydrogen Stations/ Research and Development of Low-cost Equipment, System and their Materials for Hydrogen Stations/ Research and Development of High-pressure Hydrogen Hose and Sealing System for Hydrogen Stations (FY2013 – FY2015) FY2014 Annual Report

 The influence of high-pressure hydrogen exposure on hydrogen properties, physical properties and chemical structure of sulfur cross-linked ethylene-propylene elastomer (EPDM) of which composition has various silica contents and silane coupling agents, has been investigated.The hydrogen exposure for specimens was performed at pressure of 90 MPa for 24 hours and followed decompression to atmospheric pressure. Frequency of the high-pressure hydrogen exposure was 1 or 5.
1) The hydrogen content and the volume increase of specimens after the exposure were measured at atmospheric pressure.
2) Cross-section of specimens was observed by scanning electron microscope to understand inner destruction arisen by the exposure in specimens.
3) Tensile property, hardness, rebound resilience, low temperature property, permeability to gas and dynamic viscoelasticity were measured for specimens with 30 phr silica before and after the exposure, to reveal how the high-pressure hydrogen exposure affects to physical properties of the specimens.
4) Composition, glass transition temperature and cross-linking density were measured for specimens with 30 phr silica before and after the exposure. Change in chemical structure of specimens was measured by Fourier transform-infrared spectroscopy and solid-state and swollen-state nuclear magnetic resonance spectroscopy.

 The main content of obtained from the research in FY2014 is as follows:
1) The hydrogen content, a cause of blister fracture, was decreased as silica content in specimens increased. Addition of silane coupling agent lead to an increase of hydrogen content of specimens, that is considered because of suppressed aggregation/agglomeration of silica particles in specimens. Nevertheless, some particular silane coupling agents can reduce the volume increase of specimens after the exposure.
2) The reiterated exposure grew up blisters in specimens, but relatively slight inner destruction was observed for specimens with 30 phr silica and with 3-Mercaptopropyltrimethoxysilane or 3-Methacryloxypropyltrimethoxysilane coupling agent, compared with others.
3) Hardness and tensile stress tended to lower after the exposure, but rebound resilience was almost unchanged. TR test indicated that low temperature property of specimens was maintained before and after the exposure. Dynamic viscoelasticity measurement suggested temperature dependence of storage and loss modulus was not affected by the exposure. Furthermore, no obvious change of permeability to gas was observed after the exposure.
4) No change in chemical structure was observed for specimens after the exposure up to 5 times, compared with before the exposure. However, considering that high-pressure hydrogen exposure causes inner destruction in specimens, increasing number of the exposure more than 5 times would raise a damage of the molecular chains, and it may become detectable as a change of cross-linking density, for instance.
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