Block Ionomers for Fuel Cell Application

Diat, Olivier; Gebel, Gérard

doi:10.1002/9783527610570.ch15

Cited by 2 publications

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“…Polymers containing ionizable functional groups form the basis of materials that support selective ion transport in many practical applications, including water purification, chemical separations, and electric power generation. [1][2][3][4] Fluorinated ion-containing polymers have played an important role in the development of membrane separators for electrolytic production of Cl 2 and H 2 and have been adapted for use in polymer electrolyte membrane fuel cells [3][4][5][6][7] and chemical sensors. [8][9][10] Although technologically important, fluorinated ionomers are also interesting from the standpoint of their fundamental properties that derive from their structure on the nanoscale (c.f.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopy for the Determination of Ionizable Group Content in Ionomer Materials

et al. 2017

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An approach based on vibrational spectral measurements is described for determining the ionizable group content of ion conducting polymer membrane materials. Aimed at supporting the assessment of membrane stability and wear characteristics, performance is evaluated for attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy, confocal Raman microscopy, and ATR FT-IR microscopy using perfluorinated ionomer membrane standards. One set of ionomer standards contained a sulfonic acid ionizable group and the other a sulfonyl imide group. The average number of backbone tetrafluoroethylene (TFE) units separating the ionizable-group containing side chains was in the range of 7.2-2.1 (sulfonic acid set) and 10.5-4.6 (sulfonyl imide set). A poly(tetrafluoroethylene) (PTFE) sample was included as a blank, representing the limit of zero ionizable group (and maximum TFE) content. Calibration relationships were derived from area-normalized vibrational spectra. For all three methods, calibration models applied to independent spectral measurements of samples predicted the ratio of backbone TFE groups to ionizable groups in the repeat unit ( m) with a standard error of ≤ ±0.3. The confocal Raman and ATR FT-IR microscopy techniques achieved ideal blank responses and the lowest prediction errors, down to m ± 0.1 at the 90% confidence level. With its relative simplicity, low sample size requirements, and potential for quantitative micron-scale spatial mapping of the ionizable group content within a membrane, the approach has application to advancing materials development, including exploratory synthesis, durability and wear assessment, and in situ studies of membrane process.

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Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopy for the Determination of Ionizable Group Content in Ionomer Materials

et al. 2017

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Ionomers

Kim¹,

Luqman²,

Song³

2010

Encyclopedia of Polymer Science and Technology

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Since the early 1950s, the introduction of ionic groups has been recognized as a tool that can change the polymer properties. Thus, ionomers, polymers that contain a small amount of ionic groups along the polymer backbone chains, have received considerable attention from industrial as well as academic arenas. It has been found that ionomers exhibit unique properties and morphology, such as two T g s, high melt viscosity, transport behavior, and SAXS “ionomer” peak. In this article, we set out with a introduction on ionomers, and then move on to multiplet/cluster concepts. Subsequently, the glass transition temperatures of ionomers have been discussed. The next section is devoted to a discussion of physical properties of various ionomers, that is, polyethylene‐based ionomers, polytetrafluoroethylene‐based ionomers, polystyrene‐based ionomers, block ionomers, telechelic ionomers, and star ionomers. In the following section, three different types of plasticization using polar, non‐polar, and amphiphilic plasticizers are discussed. Then, various ionic interactions as a tool for miscibility improvement are described. The last section deals with the applications of ionomers briefly.

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Block Ionomers for Fuel Cell Application

Cited by 2 publications

References 103 publications

Vibrational Spectroscopy for the Determination of Ionizable Group Content in Ionomer Materials

Vibrational Spectroscopy for the Determination of Ionizable Group Content in Ionomer Materials

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