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Sulfonated poly(vinyl alcohol)/triazole blends as anhydrous proton conducting membranes for polymer electrolyte membrane fuel cells

Published online by Cambridge University Press:  16 May 2013

Mehtap Safak Boroglu ,
Sevim Unugur Celik ,
Ismail Boz  and
Ayhan Bozkurt
Mehtap Safak Boroglu*
Affiliation:
Department of Chemical Engineering, Istanbul University, 34320 Avcilar, Istanbul, Turkey
Sevim Unugur Celik
Affiliation:
Department of Chemistry, Fatih University, 34500 Buyukcekmece, Istanbul, Turkey
Ismail Boz
Affiliation:
Department of Chemical Engineering, Istanbul University, 34320 Avcilar, Istanbul, Turkey
Ayhan Bozkurt
Affiliation:
Department of Chemistry, Fatih University, 34500 Buyukcekmece, Istanbul, Turkey
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A new type of cross-linked poly(vinyl alcohol) (PVA)-sulfosuccinic acid (SSA) polymers were synthesized by varying the amount of SSA and then blending with 3-amino-1,2,4-triazole (ATri) and 1H-1,2,4-triazole (Tri) at different stoichiometric ratios to obtain proton conductive membranes in anhydrous state. The proton conductivities of membranes were investigated as a function of azole composition, SSA composition, and operating temperature. The final structures of the copolymers were confirmed by Fourier transform infrared spectra. The resultant hybrid membranes are transparent, flexible, and showed good thermal stability up to approximately 200 °C. Differential scanning calorimetry results illustrated the homogeneity of the materials. The cross-linking of the structure was confirmed by the alteration of solubility of the membranes. Methanol permeability measurements showed that the composite membranes have lower methanol permeability compared to Nafion 112. The proton conductivity of the membranes continuously increased with increasing SO3H content and 3-amino-1,2,4-triazole (ATri) content. A maximum proton conductivity of 7.26 × 10−3 S/cm was achieved for ATri-3 at 140 °C under anhydrous conditions. Incorporation of ATri unit (according to Tri unit) significantly increased the proton conductivity of the membranes, probably due to the ion transport channel or network structures formed in the membranes.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 11 , 14 June 2013 , pp. 1458 - 1465
Copyright
Copyright © Materials Research Society 2013 

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