دورية
Water Uptake and Conductivity of Cross-linked SPEEK Membranes
| العنوان: | Water Uptake and Conductivity of Cross-linked SPEEK Membranes |
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| المؤلفون: | Linkous, Clovis A., Rhoden, Stephen L., Linkous, William G., Pearman, Benjamin P., Mohajeri, Nahid |
| المصدر: | ECS Transactions; October 2008, Vol. 16 Issue: 2 p705-710, 6p |
| مستخلص: | Water uptake is an important attribute of all membrane electrolytes, as it is related to mechanical strength, creep, and dimensional stability. Thus some means of controlling water uptake by a hydrophilic sulfonic acid polymer is desirable. This is particularly important for SPEEK, which at high degrees of sulfonation (i.e., low equivalent weight) has demonstrated substantial water uptake, on order of 10's of water molecules per sulfonic acid unit. We have attempted to control water uptake in SPEEK membranes by performing cross-linking reactions on the finished polymer. Water-soluble SPEEK (85% degree of sulfonation, or 418 g/eq EW), 1,4-benzenedimethanol, and various transition metal chloride catalysts were cast together to form a membrane that was heated at 200 oC for 10 min. The resulting insoluble membrane was shown to have conductivity comparable to an uncross-linked SPEEK membrane over a range of relative humidities. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 19385862 19386737 |
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