Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 974, Issue 1-3, Pages 56-59Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2009.12.040
Keywords
Perturbation-correlation; Moving-window; Two-dimensional correlation spectroscopy; Nafion; Infrared
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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.
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