کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
637944 1456155 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of polyaniline intercalations on the conductivity and permselectivity of perfluorinated cation-exchange membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Influence of polyaniline intercalations on the conductivity and permselectivity of perfluorinated cation-exchange membranes
چکیده انگلیسی

This work describes the effect of polyaniline intercalations, produced by polymerization in situ of aniline in perfluorinated sulfocationic polymer templates, on the electrochemical properties of the resulting composite membrane. During the polymerization in situ process, the color of the template evolves rapidly from white to blue and then to emerald green. After 5 h of aniline polymerization, both pristine and composite membranes exhibit higher protonic conductivity than aqueous sulfuric acid solutions with concentrations lower than 0.1 M. After a polymerization time of 30 days, intercalations made up of a mixture of emeraldine and pernigraniline are formed that reduce the conductivity to one-third of that corresponding to the pristine acid membranes. The electroosmotic water transport number across both the pristine and composite acid membranes is about 3 mol/Faraday, a rather low value explained by the high protonic conductivity of the membranes. Apparent cation transport numbers determined from electromotive forces of concentration cells are little affected by the polyaniline intercalations and their values are rather close to those calculated taking the membranes as reference frame.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 318, Issues 1–2, 20 June 2008, Pages 255–263
نویسندگان
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