Vibrational and thermal characterization of Nafion® membranes substituted by alkaline earth cations

被引:45
作者
Lage, LG [1 ]
Delgado, PG [1 ]
Kawano, Y [1 ]
机构
[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, BR-05513970 Sao Paulo, Brazil
关键词
Nation (R); perfluorosulfonated ionomers; photoacoustic infrared spectroscopy; FT-Raman; DSC; TG;
D O I
10.1016/j.europolymj.2004.02.021
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The vibrational spectra of Nafion(R) membranes with alkaline earth cations as counterions have been obtained by photoacoustic infrared spectroscopy (PAS-IR) and Fourier transform Raman spectroscopy (FT-Raman). The symmetrical stretching band of the sulfonate group (similar to1060 cm(-1)) decreases with increasing atomic mass of the counter-cation, excepting for Mg2+, in both techniques. The thermal behavior of Nafion membranes by means of differential scanning calorimetry (DSC) curves showed a dependence on the water content and a similar profile between Nafion-Mg2+ and -Ca2+, and between Nafion-Sr2+ and -Ba2+, for the first scanning curve. An ageing effect was also observed on Nafion by DSC curves. High-resolution thermogravimetry (TG) curves under nitrogen atmosphere showed similar decomposition profiles. It was determined from TG curves that there is a decreasing water content with increasing ionic radius of cation, and the thermal stability increasing from Nafion-Mg2+ to -Ba2+. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1309 / 1316
页数:8
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