The role of a metal ion within Nafion upon its physical and gas transport properties

Yanfang Fan; Drew Tongren; Chris J. Cornelius

doi:10.1016/j.eurpolymj.2013.11.011

The role of a metal ion within Nafion upon its physical and gas transport properties

Yanfang Fan, Drew Tongren, Chris J. Cornelius

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

The physical and transport properties of Li⁺, Na⁺, K⁺, and Ca²⁺ neutralized Nafion were compared to its acid form. Nafion crystallinity was disrupted with a variety of cations while average d-spacing remained constant. Higher thermal stability in metal ion exchanged Nafion was observed using TGA. Ionic interactions were probed by DMA and spectroscopic techniques. Divalent Ca²⁺ exhibited a distinctive influence on the chain's mobility as compared to monovalent ions. The interaction strength cation exchanged Nafion decreased in the following order: Li⁺ > Ca²⁺ > Na⁺ > K⁺. Gas permeability increases were primarily attributed to gas solubility. Nafion had a higher gas activation energy E_p, but its permeability was lower than unsulfonated PTFE.

Original language	English (US)
Pages (from-to)	271-278
Number of pages	8
Journal	European Polymer Journal
Volume	50
Issue number	1
DOIs	https://doi.org/10.1016/j.eurpolymj.2013.11.011
State	Published - Jan 2014

Keywords

Cation interaction
Gas transport
Ionomer
Nafion
Physical properties

ASJC Scopus subject areas

Materials Chemistry
Polymers and Plastics
General Physics and Astronomy
Organic Chemistry

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10.1016/j.eurpolymj.2013.11.011

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abstract = "The physical and transport properties of Li+, Na+, K+, and Ca2+ neutralized Nafion were compared to its acid form. Nafion crystallinity was disrupted with a variety of cations while average d-spacing remained constant. Higher thermal stability in metal ion exchanged Nafion was observed using TGA. Ionic interactions were probed by DMA and spectroscopic techniques. Divalent Ca2+ exhibited a distinctive influence on the chain's mobility as compared to monovalent ions. The interaction strength cation exchanged Nafion decreased in the following order: Li+ > Ca2+ > Na+ > K+. Gas permeability increases were primarily attributed to gas solubility. Nafion had a higher gas activation energy Ep, but its permeability was lower than unsulfonated PTFE.",

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AU - Cornelius, Chris J.

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AB - The physical and transport properties of Li+, Na+, K+, and Ca2+ neutralized Nafion were compared to its acid form. Nafion crystallinity was disrupted with a variety of cations while average d-spacing remained constant. Higher thermal stability in metal ion exchanged Nafion was observed using TGA. Ionic interactions were probed by DMA and spectroscopic techniques. Divalent Ca2+ exhibited a distinctive influence on the chain's mobility as compared to monovalent ions. The interaction strength cation exchanged Nafion decreased in the following order: Li+ > Ca2+ > Na+ > K+. Gas permeability increases were primarily attributed to gas solubility. Nafion had a higher gas activation energy Ep, but its permeability was lower than unsulfonated PTFE.

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KW - Gas transport

KW - Ionomer

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KW - Physical properties

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The role of a metal ion within Nafion upon its physical and gas transport properties

Abstract

Keywords

ASJC Scopus subject areas

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