کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1292021 | 973380 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low temperature thermal properties of Nafion 117 membranes in water and methanol-water mixtures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
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چکیده انگلیسی
The low temperature thermal behavior of Nafion 117 membranes with different water contents and equilibrated with water–methanol mixtures of different concentrations were studied by differential scanning calorimetry (DSC). The DSC curves revealed a weak transition at temperatures below −100 °C, related to the γ peak reported in mechanical dynamics studies, and associated to the true glass transition temperature of the polymer. The amount of freezable water was determined from the area of the ice fusion peak and it increased from 1 to 23% as the relative humidity increases from 84 to 100%. The presence of methanol in the membrane increased the amount of freezable water up to 65%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 161, Issue 2, 27 October 2006, Pages 799–805
Journal: Journal of Power Sources - Volume 161, Issue 2, 27 October 2006, Pages 799–805
نویسندگان
Horacio R. Corti, Federico Nores-Pondal, M. Pilar Buera,