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成果報告書詳細
管理番号20170000000117
タイトル*平成28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
公開日2017/6/2
報告書年度2016 - 2016
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-FY2017) FY2016 Annual Report

1.1 Research on the influence of high pressure hydrogen exposure on ethylene-propylene diene elastomer (EPDM).
 For FY2014-2015, sulfur-crosslinked EPDMs with various amounts of silica and/or type of silane-coupling agent have been prepared. And these have been exposed to 90 MPa hydrogen and evaluated. It was revealed that amount of silica and/or type of silane-coupling agent have affected degrees of the influence of hydrogen exposure. For FY2016, EPDMs with bis[3-(triethoxysilyl)propyl] tetrasulfide (TESPT) as silane coupling agent are exposed to 90 MPa hydrogen gas for 24 hours and followed decompression to atmospheric pressure, at 1, 5 or 20 times, and evaluated.
(1) The dissolving hydrogen amount and the volume increase rate of EPDMs are measured after exposure.
(2) Scanning electron microscope (SEM) observation is performed in cross section of EPDMs after exposure to inspect any internal fracture caused by the exposure.
(3) Tensile strength, hardness, resilience, low-temperature property, gas permeability and dynamic viscoelasticity are measured to investigate changes in physical properties induced by the exposure.
(4) Composition, glass transition temperature, and crosslinking density are measured before/after the exposure. Chemical structure of EPDMs is analyzed by fourier transform-infrared spectroscopy and solid-state and swollen-state nuclear magnetic resonance spectroscopy.
 The results from the section are as follows:
(1) It is revealed that addition of TESPT can reduce the volume increase of exposed EPDM although it increases the dissolving hydrogen amount. It is considered that resulted from decrease of silica particles aggregation and agglomeration.
(2) The repeated exposure causes blister fracture inside EPDMs. Internal fracture in EPDMs with TESPT is as slight as observed for EPDMs with 3-Mercaptopropyltrimethoxysilane or with 3-Methacryloxypropyltrimethoxysilane.
(3) Exposed EPDMs show a downward tendency of hardness and tensile strength. No significant change is observed in physical properties other than hardness and tensile strength.
(4) No significant change in chemical structure has been detected for the current exposure conditions.

1.2 Comparison of internal fractures toward depth direction.
 SEM observation is performed in the direction from the surface to the inner part for EPDMs after 20 times exposure. For all EPDMs, slighter internal fracture is observed near the surface compared to that in the inner part. It is thought that the difference might result from behavior of hydrogen molecules; the molecules near the surface can easily desorb whereas the molecules about the inner part collide each other before desorption.

1.3 The evaluation of carbon black (CB) filled EPDMs.
 Physical and chemical properties of EPDMs with CB which are various aggregate and agglomerate size, particle size or degrees of dispersion are measured at ambient condition.
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