Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments

This paper studies the aging mechanism of elastomeric gaskets made from silicone rubbers in simulated proton exchange membrane fuel cells (PEMFCs) in humid, acidic, and high-temperature environments. The changes in the surface morphology are observed using optical microscopy. Attenuated total reflec...

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Autores principales:	Li Guo, Zhu Dasheng, Jia Wenhua, Zhang Feng
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	degradation mechanism silicone stress relaxation fuel cell lifetime Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/71a168bf60b94e39b76209d7697f5112
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spelling	oai:doaj.org-article:71a168bf60b94e39b76209d7697f51122021-12-05T14:10:48ZAnalysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments1618-722910.1515/epoly-2021-0078https://doaj.org/article/71a168bf60b94e39b76209d7697f51122021-11-01T00:00:00Zhttps://doi.org/10.1515/epoly-2021-0078https://doaj.org/toc/1618-7229This paper studies the aging mechanism of elastomeric gaskets made from silicone rubbers in simulated proton exchange membrane fuel cells (PEMFCs) in humid, acidic, and high-temperature environments. The changes in the surface morphology are observed using optical microscopy. Attenuated total reflection Fourier transform infrared spectroscopy (AFT-FTIR) and X-ray photoelectron spectroscopy (XPS) are used to investigate the changes in the chemical molecular structure. The stress relaxation test is conducted to characterize the decay process of the mechanical properties. The results indicate that cracks appear on the surface and that the aging mechanism is mainly due to decomposition in the backbone and hydrolysis of the crosslinking. The stress relaxation modulus decreases as the acid concentration increases, which suggests a decrease in elasticity and an increase in brittleness. A master curve that relates time and concentration is constructed. Based on this inference, the experimental time can be shortened by about four times.Li GuoZhu DashengJia WenhuaZhang FengDe Gruyterarticledegradation mechanismsiliconestress relaxationfuel celllifetimePolymers and polymer manufactureTP1080-1185ENe-Polymers, Vol 21, Iss 1, Pp 921-929 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	degradation mechanism silicone stress relaxation fuel cell lifetime Polymers and polymer manufacture TP1080-1185
spellingShingle	degradation mechanism silicone stress relaxation fuel cell lifetime Polymers and polymer manufacture TP1080-1185 Li Guo Zhu Dasheng Jia Wenhua Zhang Feng Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
description	This paper studies the aging mechanism of elastomeric gaskets made from silicone rubbers in simulated proton exchange membrane fuel cells (PEMFCs) in humid, acidic, and high-temperature environments. The changes in the surface morphology are observed using optical microscopy. Attenuated total reflection Fourier transform infrared spectroscopy (AFT-FTIR) and X-ray photoelectron spectroscopy (XPS) are used to investigate the changes in the chemical molecular structure. The stress relaxation test is conducted to characterize the decay process of the mechanical properties. The results indicate that cracks appear on the surface and that the aging mechanism is mainly due to decomposition in the backbone and hydrolysis of the crosslinking. The stress relaxation modulus decreases as the acid concentration increases, which suggests a decrease in elasticity and an increase in brittleness. A master curve that relates time and concentration is constructed. Based on this inference, the experimental time can be shortened by about four times.
format	article
author	Li Guo Zhu Dasheng Jia Wenhua Zhang Feng
author_facet	Li Guo Zhu Dasheng Jia Wenhua Zhang Feng
author_sort	Li Guo
title	Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
title_short	Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
title_full	Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
title_fullStr	Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
title_full_unstemmed	Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
title_sort	analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/71a168bf60b94e39b76209d7697f5112
work_keys_str_mv	AT liguo analysisoftheagingmechanismandlifeevaluationofelastomersinsimulatedprotonexchangemembranefuelcellenvironments AT zhudasheng analysisoftheagingmechanismandlifeevaluationofelastomersinsimulatedprotonexchangemembranefuelcellenvironments AT jiawenhua analysisoftheagingmechanismandlifeevaluationofelastomersinsimulatedprotonexchangemembranefuelcellenvironments AT zhangfeng analysisoftheagingmechanismandlifeevaluationofelastomersinsimulatedprotonexchangemembranefuelcellenvironments
_version_	1718371728914120704

Analysis of the aging mechanism and life evaluation of elastomers in simulated proton exchange membrane fuel cell environments

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