Journal article
Ion Exchange Capacity of Nafion and Nafion Composites
Langmuir, Vol.16(6), pp.2866-2871
03/21/2000
DOI: 10.1021/la991094x
Abstract
The ion exchange capacity of recast Nafion films and composites of Nafion and polystyrene microbeads is determined by titration. Composite formation enhances exchange capacity; exchange capacity increases with the surface area of microbeads in the composite. For recast films, an equivalent weight of 996 ± 24 is found, whereas the lowest equivalent weight (highest exchange capacity) found for a composite is 878 ± 8. This suggests that ≳13% of the exchange sites within recast films are inaccessible for ion exchange; for 1100 equivalent weight material, ≳25% of the sulfonates are inaccessible. Equivalent weight results are consistent with an ordered interfacial domain between Nafion and the microbeads. A fractal model based on microbead radii, microbead fraction, and interfacial domain thickness provides a predictive model for designing composites with increased exchange capacity and cation transport.
Details
- Title: Subtitle
- Ion Exchange Capacity of Nafion and Nafion Composites
- Creators
- Ta-Yung ChenJohna Leddy
- Resource Type
- Journal article
- Publication Details
- Langmuir, Vol.16(6), pp.2866-2871
- Publisher
- American Chemical Society
- DOI
- 10.1021/la991094x
- ISSN
- 0743-7463
- eISSN
- 1520-5827
- Language
- English
- Date published
- 03/21/2000
- Academic Unit
- Chemistry
- Record Identifier
- 9983985702302771
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