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

来源：

EUROPEAN POLYMER JOURNAL | 2004年 / 40卷 / 07期

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

页码：1309 / 1316

页数：8