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Issue 4, 2011
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Azole substituted polyphosphazenes as nonhumidified proton conducting membranes

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Abstract

Novel nonhumidified proton conducting membranes have been prepared from the reactions of triazole (Tri) and aminotriazole (Atri) compounds with poly[(4-methylphenoxy)chlorophosphazene] (PMPCP). The composition of the novel polymers (TriP and AtriP) was verified by elemental analysis (EA) and the structure was characterized by FT-IR, 1H and 31P NMR. Size exclusion chromatography was used to confirm the polymer formation. Thermogravimetric analysis (TGA) showed that the samples are thermally stable up to approximately 150 °C. Differential scanning calorimetry (DSC) results illustrated the homogeneity of the materials. To obtain sufficient proton conductivity at high temperatures in the anhydrous state, the polymers were doped with trifluoromethanesulfonic acid (TA) at various molar ratios, x = 0.5, 1, 2 and 3 with respect to the azole unit. The proton conductivity of the polymer electrolytes was measured using high resolution dielectric-impedance analyzer. The proton conductivity of these materials increased with dopant concentration and temperature. Maximum proton conductivity of TriP2TA and AtriP2TA were obtained as 3 × 10−3 S cm−1 at 50 °C and 0.0412 S cm−1 at 130 °C respectively, in the anhydrous state.

Graphical abstract: Azole substituted polyphosphazenes as nonhumidified proton conducting membranes

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Publication details

The article was received on 16 May 2010, accepted on 04 Oct 2010 and first published on 12 Nov 2010


Article type: Paper
DOI: 10.1039/C0JM01466D
Citation: J. Mater. Chem., 2011,21, 1020-1027
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    Azole substituted polyphosphazenes as nonhumidified proton conducting membranes

    F. Hacıvelioğlu, Ş. Özden, S. Ü. Çelik, S. Yeşilot, A. Kılıç and A. Bozkurt, J. Mater. Chem., 2011, 21, 1020
    DOI: 10.1039/C0JM01466D

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