Abstract
Hydrogen molecules dissolved in rubber due to high-pressure hydrogen gas exposure have been analyzed using 1 H nuclear magnetic resonance (NMR) with solution and solid-state probes. To analyze the characteristics of dissolved hydrogen in rubber materials and to compare them with gaseous phase hydrogen, we measured the NMR spectra of gaseous phase hydrogen and evaluated the chemical shifts and pressure dependency. Measurement using a sealed tube and liquid phase probes enabled the simultaneous analysis of dissolved hydrogen in rubber and gaseous phase hydrogen eliminated from the rubber. Two peaks at 4.3 and 4.8 p.p.m. were observed in the 1H MAS NMR of the rubber samples after high-pressure hydrogen exposure. Using information from the chemical shift of the free hydrogen gas and the time dependency of hydrogen quantification in the rubber, both of these peaks were confirmed to be attributable to dissolved hydrogen. Their differences in relaxation time confirmed that their mobilities were different. In conclusion, the hydrogen dissolved in acrylonitrile butadiene rubber exists in two different forms with different mobilities. The ratio of those two hydrogens differs and is affected by the exposure pressure and elimination process time.
| Original language | English |
|---|---|
| Pages (from-to) | 832-837 |
| Number of pages | 6 |
| Journal | Polymer Journal |
| Volume | 44 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 1 2012 |
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All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Materials Chemistry
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Evaluation of hydrogen dissolved in rubber materials under high-pressure exposure using nuclear magnetic resonance. / Fujiwara, Hirotada; Nishimura, Shin.
In: Polymer Journal, Vol. 44, No. 8, 01.08.2012, p. 832-837.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaluation of hydrogen dissolved in rubber materials under high-pressure exposure using nuclear magnetic resonance
AU - Fujiwara, Hirotada
AU - Nishimura, Shin
PY - 2012/8/1
Y1 - 2012/8/1
N2 - Hydrogen molecules dissolved in rubber due to high-pressure hydrogen gas exposure have been analyzed using 1 H nuclear magnetic resonance (NMR) with solution and solid-state probes. To analyze the characteristics of dissolved hydrogen in rubber materials and to compare them with gaseous phase hydrogen, we measured the NMR spectra of gaseous phase hydrogen and evaluated the chemical shifts and pressure dependency. Measurement using a sealed tube and liquid phase probes enabled the simultaneous analysis of dissolved hydrogen in rubber and gaseous phase hydrogen eliminated from the rubber. Two peaks at 4.3 and 4.8 p.p.m. were observed in the 1H MAS NMR of the rubber samples after high-pressure hydrogen exposure. Using information from the chemical shift of the free hydrogen gas and the time dependency of hydrogen quantification in the rubber, both of these peaks were confirmed to be attributable to dissolved hydrogen. Their differences in relaxation time confirmed that their mobilities were different. In conclusion, the hydrogen dissolved in acrylonitrile butadiene rubber exists in two different forms with different mobilities. The ratio of those two hydrogens differs and is affected by the exposure pressure and elimination process time.
AB - Hydrogen molecules dissolved in rubber due to high-pressure hydrogen gas exposure have been analyzed using 1 H nuclear magnetic resonance (NMR) with solution and solid-state probes. To analyze the characteristics of dissolved hydrogen in rubber materials and to compare them with gaseous phase hydrogen, we measured the NMR spectra of gaseous phase hydrogen and evaluated the chemical shifts and pressure dependency. Measurement using a sealed tube and liquid phase probes enabled the simultaneous analysis of dissolved hydrogen in rubber and gaseous phase hydrogen eliminated from the rubber. Two peaks at 4.3 and 4.8 p.p.m. were observed in the 1H MAS NMR of the rubber samples after high-pressure hydrogen exposure. Using information from the chemical shift of the free hydrogen gas and the time dependency of hydrogen quantification in the rubber, both of these peaks were confirmed to be attributable to dissolved hydrogen. Their differences in relaxation time confirmed that their mobilities were different. In conclusion, the hydrogen dissolved in acrylonitrile butadiene rubber exists in two different forms with different mobilities. The ratio of those two hydrogens differs and is affected by the exposure pressure and elimination process time.
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U2 - 10.1038/pj.2012.111
DO - 10.1038/pj.2012.111
M3 - Article
AN - SCOPUS:84864704646
VL - 44
SP - 832
EP - 837
JO - Polymer Journal
JF - Polymer Journal
SN - 0032-3896
IS - 8
ER -