Highly phosphonated polypentafluorostyrene: Characterization and blends with polybenzimidazole

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• 作者：Vladimir Atanasov ; Dietrich Gudat ; Bastian Ruffmann ; Jochen Kerres
• 关键词：Phosphonated polymer ; Polyelectrolyte ; Fuel cell ; Conductivity ; Blend membrane ; Doping with phosphoric acid
• 刊名：European Polymer Journal
• 出版年：December, 2013
• 年：2013
• 卷：49
• 期：12
• 页码：3977-3985
• 全文大小：1414 K

文摘

In this study we present results of the conductivity and resistance to thermooxidative and condensation reactions of a highly phosphonated poly(pentafluorostyrene) (PWN2010) and of its blends with poly(benzimidazole)s (PBI). This polymer, which combines both: (i) a high degree of phosphonation (above 90%) and (ii) a relatively high acidity (pK_a (-PO₃H₂ 鈫?#xA0;-PO₃H^{鈭?/sup>) 鈭?#xA0;0.5) due to the fluorine neighbors, is designed for low humidity operating fuel cell. This was confirmed by the conductivity measurements for PWN2010 reaching 蟽 = 5 脳 10鈭? S cm鈭? at 150 掳C in dry N₂ and 蟽 = 1 脳 10鈭? S cm鈭? at 150 掳C (位 = 0.75). Furthermore, this polymer showed only 48% of anhydride formation when annealing it at T = 250 掳C for 5 h and only 2% weight loss during a 96 h Fenton test. These properties combined with the ability of the PWN2010 to form homogeneous blends with polybenzimidazoles resulting in stable and flexible polymer films, makes PWN2010 a very promising candidate as a polymer electrolyte for intermediate- and high-temperature fuel cell applications.}