کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
638873 1456191 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Proton mobility in hydrated sulfonated polystyrene: NMR and impedance studies
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Proton mobility in hydrated sulfonated polystyrene: NMR and impedance studies
چکیده انگلیسی

Different ionomers were obtained by sulfonation of a commercial polystyrene (PS), using acetyl sulfate as reagent. The sulfonation was assessed by FTIR and XPS spectroscopies and the thermal and mechanical properties were deduced from DMA measurements. The acid form of the ionomers was characterized by means of 1H and 13C MAS-NMR spectroscopies. Polymer hydration under controlled humidity atmosphere was analyzed by gravimetric, NMR and complex impedance techniques. In the hydrated state, two stages associated with formation of hydronium (H3O+) species and proton hopping between adsorbed water molecules were deduced from NMR data. Both processes are responsible for important changes detected in mechanical properties and conductivity of sulfonated polymers during hydration processes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 280, Issues 1–2, 1 September 2006, Pages 461–469
نویسندگان
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