Influence of high-pressure hydrogen exposure on increase in volume by gas absorption and tensile properties of sealing rubber material

Junichiro Yamabe, Masatoshi Nakao, Hirotada Fujiwara, Shin Nishimura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

When a rubber O-ring was used as a sealing material of a pressure vessel for high-pressure hydrogen gas such as 70MPa, which is the hydrogen pressure for fuel cell electric systems, the O-ring was extruded from the pressure vessel due to an increase in volume by gas absorption, and consequently cracks initiated in the previous study. Therefore, it is important to clarify the influence of hydrogen pressure on the increase in volume and mechanical properties in order to design the rubber O-ring for high-pressure hydrogen gas. From this viewpoint, unfilled and carbon black-filled sulfur-vulcanized NBR composites were exposed to hydrogen gas at a maximum pressure of 100MPa ; then, the influence of hydrogen exposure on volume increase and tensile properties of the composites was investigated. The residual hydrogen content which was measured 35 min after decompression increased with an increase in the hydrogen pressures ranging from 0.7 to 100MPa for the unfilled composite (NF) and the filled composite (CB). In contrast, the volume of NF and CB was hardly changed less than 10MPa, and the increase in volume by gas absorption was observed more than 10MPa. The elastic modulus of NF and CB decreased with an increase in volume, and this tendency can be successfully explained in term of the decrease in the crosslink density and elongation by volume increase. Although the tensile strength of NF hardly depended on the volume of specimen, the tensile strength of CB clearly decreased with an increase in volume. This is considered to be because a boundary structure between carbon black and rubber matrix was changed by hydrogen exposure.

Original languageEnglish
Pages (from-to)63-69
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume60
Issue number1
DOIs
Publication statusPublished - Jan 1 2011

Fingerprint

Gas absorption
tensile properties
Rubber
sealing
Tensile properties
rubber
Hydrogen
hydrogen
gases
O rings
Soot
pressure vessels
composite materials
Gases
Composite materials
Carbon black
Pressure vessels
tensile strength
rings
Tensile strength

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{7bc23cf744f5493883038251579e2f83,
title = "Influence of high-pressure hydrogen exposure on increase in volume by gas absorption and tensile properties of sealing rubber material",
abstract = "When a rubber O-ring was used as a sealing material of a pressure vessel for high-pressure hydrogen gas such as 70MPa, which is the hydrogen pressure for fuel cell electric systems, the O-ring was extruded from the pressure vessel due to an increase in volume by gas absorption, and consequently cracks initiated in the previous study. Therefore, it is important to clarify the influence of hydrogen pressure on the increase in volume and mechanical properties in order to design the rubber O-ring for high-pressure hydrogen gas. From this viewpoint, unfilled and carbon black-filled sulfur-vulcanized NBR composites were exposed to hydrogen gas at a maximum pressure of 100MPa ; then, the influence of hydrogen exposure on volume increase and tensile properties of the composites was investigated. The residual hydrogen content which was measured 35 min after decompression increased with an increase in the hydrogen pressures ranging from 0.7 to 100MPa for the unfilled composite (NF) and the filled composite (CB). In contrast, the volume of NF and CB was hardly changed less than 10MPa, and the increase in volume by gas absorption was observed more than 10MPa. The elastic modulus of NF and CB decreased with an increase in volume, and this tendency can be successfully explained in term of the decrease in the crosslink density and elongation by volume increase. Although the tensile strength of NF hardly depended on the volume of specimen, the tensile strength of CB clearly decreased with an increase in volume. This is considered to be because a boundary structure between carbon black and rubber matrix was changed by hydrogen exposure.",
author = "Junichiro Yamabe and Masatoshi Nakao and Hirotada Fujiwara and Shin Nishimura",
year = "2011",
month = "1",
day = "1",
doi = "10.2472/jsms.60.63",
language = "English",
volume = "60",
pages = "63--69",
journal = "Zairyo/Journal of the Society of Materials Science, Japan",
issn = "0514-5163",
publisher = "公益社団法人 日本材料学会",
number = "1",

}

TY - JOUR

T1 - Influence of high-pressure hydrogen exposure on increase in volume by gas absorption and tensile properties of sealing rubber material

AU - Yamabe, Junichiro

AU - Nakao, Masatoshi

AU - Fujiwara, Hirotada

AU - Nishimura, Shin

PY - 2011/1/1

Y1 - 2011/1/1

N2 - When a rubber O-ring was used as a sealing material of a pressure vessel for high-pressure hydrogen gas such as 70MPa, which is the hydrogen pressure for fuel cell electric systems, the O-ring was extruded from the pressure vessel due to an increase in volume by gas absorption, and consequently cracks initiated in the previous study. Therefore, it is important to clarify the influence of hydrogen pressure on the increase in volume and mechanical properties in order to design the rubber O-ring for high-pressure hydrogen gas. From this viewpoint, unfilled and carbon black-filled sulfur-vulcanized NBR composites were exposed to hydrogen gas at a maximum pressure of 100MPa ; then, the influence of hydrogen exposure on volume increase and tensile properties of the composites was investigated. The residual hydrogen content which was measured 35 min after decompression increased with an increase in the hydrogen pressures ranging from 0.7 to 100MPa for the unfilled composite (NF) and the filled composite (CB). In contrast, the volume of NF and CB was hardly changed less than 10MPa, and the increase in volume by gas absorption was observed more than 10MPa. The elastic modulus of NF and CB decreased with an increase in volume, and this tendency can be successfully explained in term of the decrease in the crosslink density and elongation by volume increase. Although the tensile strength of NF hardly depended on the volume of specimen, the tensile strength of CB clearly decreased with an increase in volume. This is considered to be because a boundary structure between carbon black and rubber matrix was changed by hydrogen exposure.

AB - When a rubber O-ring was used as a sealing material of a pressure vessel for high-pressure hydrogen gas such as 70MPa, which is the hydrogen pressure for fuel cell electric systems, the O-ring was extruded from the pressure vessel due to an increase in volume by gas absorption, and consequently cracks initiated in the previous study. Therefore, it is important to clarify the influence of hydrogen pressure on the increase in volume and mechanical properties in order to design the rubber O-ring for high-pressure hydrogen gas. From this viewpoint, unfilled and carbon black-filled sulfur-vulcanized NBR composites were exposed to hydrogen gas at a maximum pressure of 100MPa ; then, the influence of hydrogen exposure on volume increase and tensile properties of the composites was investigated. The residual hydrogen content which was measured 35 min after decompression increased with an increase in the hydrogen pressures ranging from 0.7 to 100MPa for the unfilled composite (NF) and the filled composite (CB). In contrast, the volume of NF and CB was hardly changed less than 10MPa, and the increase in volume by gas absorption was observed more than 10MPa. The elastic modulus of NF and CB decreased with an increase in volume, and this tendency can be successfully explained in term of the decrease in the crosslink density and elongation by volume increase. Although the tensile strength of NF hardly depended on the volume of specimen, the tensile strength of CB clearly decreased with an increase in volume. This is considered to be because a boundary structure between carbon black and rubber matrix was changed by hydrogen exposure.

UR - http://www.scopus.com/inward/record.url?scp=80054121768&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80054121768&partnerID=8YFLogxK

U2 - 10.2472/jsms.60.63

DO - 10.2472/jsms.60.63

M3 - Article

AN - SCOPUS:80054121768

VL - 60

SP - 63

EP - 69

JO - Zairyo/Journal of the Society of Materials Science, Japan

JF - Zairyo/Journal of the Society of Materials Science, Japan

SN - 0514-5163

IS - 1

ER -