Spectroscopic investigations into degradation of polymer membranes for fuel cells applications

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• 作者：Krzysztof Kruczał ; a ; Krzysztof Szczubiał ; ka ; Ł ; ukasz Ł ; ań ; cucki ; Izabela Zastawny ; Kinga Gó ; ra-Marek ; Krystyna Dyrek ; Zbigniew Sojka
• 关键词：EPR ; Fuel cell ; PEM ; Spin catalysis ; Polymer degradation ; Polymer stabilization
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：69
• 期：5
• 页码：1337-1343
• 全文大小：654 K

文摘

The research was focused on synthesis of proton conductive, easily degradable polymer membranes, which can be used as a model system to verify the efficiency of transition metal ions (TMI) in prevention of polymer degradation. Two polymers composed of 2-hydroxyethyl methacrylate (HEMA), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), and styrenesulfonic acid (SS) were synthesized. The copolymers were characterized by gel permeation chromatography (GPC), elementary analysis, and FTIR and fluorescence spectroscopies. The results allowed determination of weight-average molecular weight and the copolymer composition. The protons of sulfonic groups were substituted by paramagnetic transition metal ions of various spin states (Cr³⁺, S = 3/2 and Mn²⁺, S = 5/2) with the loading varying from 0.5 up to 10 mol % . The effectiveness of spin catalysis was checked by EPR. The results obtained indicate enhancement of polymer stability in the presence of Mn²⁺.