FTIR-ATR Study of Water Distribution in a Short-Side-Chain PFSI Membrane
作者： Maria-Chiara Ferrari , Jacopo Catalano , Marco Giacinti Baschetti , Maria Grazia De Angelis , Giulio Cesare Sarti
DOI: 10.1021/MA202099P
关键词: Population 、 Sorption 、 Water vapor 、 Analytical chemistry 、 Membrane 、 Chemistry 、 Adsorption 、 Sulfonate 、 Ionomer 、 Infrared spectroscopy
摘要: Fourier transform infrared–attenuated total reflectance (FTIR-ATR) spectroscopy was used to study in detail water vapor sorption a short-side-chain perfluorosulfonic acid ionomer membrane suitable for use as electrolyte proton exchange membranes fuel cells. The analysis of the IR spectra, at different values relative humidity (0.00–0.50) and 35 °C, allows identify four types molecules, characterized by decreasing strength interaction with polymer sulfonate groups. actual concentration species inside determined calibrating absorbance data independent measurements uptake. populations can be represented Langmuir isotherms: first population is directly attached sites, while others form subsequent layers, adsorbed one onto other shell-like structure. To describe overall behavior populations, ...
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