Temperature-dependent structure changes in Nafion ionomer studied by PCMW2D IR correlation spectroscopy
Temperature-dependent structure changes in Nafion ionomer studied by PCMW2D IR correlation spectroscopy
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DOI：
10.1016/j.molstruc.2009.12.040
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发表时间：
2010-06-16
影响因子：
3.8
通讯作者：
Kitagawa, Kuniyuki
中科院分区：
文献类型：
--
作者：
Morita, Shigeaki;Kitagawa, Kuniyuki
在30至320 ℃的温度范围内测量了Nafion膜的温度依赖性红外（IR）光谱。使用微扰相关移动窗口二维（PCMW2D）相关光谱和量子化学计算（QCC）分析所获得的光谱。温度引起的Nafion离聚体的结构变化的三个步骤被揭示。离聚物的脱水在60 ℃以下占主导地位。侧链末端的磺酸酯基团的质子化发生在100 ℃左右。链的热降解在280摄氏度以上开始。(C)2009爱思唯尔有限公司版权所有。
Temperature-dependent infrared (IR) spectra of a Nafion membrane were measured over a temperature range from 30 to 320 degrees C. The obtained spectra were analyzed using perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy and quantum chemical calculations (QCC). Three-step structural changes in Nafion ionomer induced by temperature were revealed. Dehydration of the ionomer is dominant below 60 degrees C. Protonation of sulfonate group in the side chain terminal occurs around 100 degrees C. Thermal degradation of the chains starts above 280 degrees C. (C) 2009 Elsevier B.V. All rights reserved.