کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1297269 1498412 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of EVOH based single ion polymer electrolyte: Composition and microstructure effects on the proton conductivity
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Study of EVOH based single ion polymer electrolyte: Composition and microstructure effects on the proton conductivity
چکیده انگلیسی

A comb-like EVOH based single ion polymer electrolyte (EVOH-g-SPEG) was synthesized by sulfonification of EVOH grafts 2-(2-chloroethoxy) ethanol (C4H9O2Cl)/2-[2-(2-chloroethxy) ethoxy] ethanol (C6H13O3Cl) with 1, 3-propane sultone. The main chain of the comb-like polymer is hydrophobic polyethylene segments; the side chain is hydrophilic poly (ethylene glycol) (PEG) segment, which can solubilize large amounts of inorganic salts. The sulfonic acid group was introduced onto the end of the PEG side chain. The acid form of SPE was successfully obtained by being dialyzed from the products with acid solution. The saturation water sorption of EVOH-g-SPEG membrane increased with the side chain length and the immersion time. The XRD results indicate that the water in SPE membrane region can destroy the membrane crystalline structure and the water absorption membranes are nearly amorphous. AFM phase images of the hydration membranes clearly show the hydrophilic domains, with sizes increasing from 10 to 35 nm as a function of the side chain length. A phase inversion could be observed when n ≥ 5, which was consistent with a rapid increase in water absorption. And the ion conductivity is also measured by AC impedance. The conductivity is greatly influenced by ion exchange capacity and water sorption. The comb-like EVOH-g-SPEG polymer electrolyte grafts with 2 PEG side chain provides the highest ionic conductivity (1.65 × 10− 3 S cm− 1). The comb-like polymer could be a candidate as new polymeric electrolyte material for fuel cells and other electrochemical devices.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 177, Issues 1–2, 16 January 2006, Pages 65–71
نویسندگان
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