Advanced Search

    GUO Yufei, GUO Zhihai, ZHANG Chongyin, WANG Wenbin, LIU Feiyue, GUO Xiaoxia, FANG Jianhua. Preparation and Properties of Novel Sulfonated Poly(ether ketone benzimidazole) Copolymers for Fuel Cells[J]. Journal of Functional Polymers, 2020, 33(5): 473-482. doi: 10.14133/j.cnki.1008-9357.20191230001
    Citation: GUO Yufei, GUO Zhihai, ZHANG Chongyin, WANG Wenbin, LIU Feiyue, GUO Xiaoxia, FANG Jianhua. Preparation and Properties of Novel Sulfonated Poly(ether ketone benzimidazole) Copolymers for Fuel Cells[J]. Journal of Functional Polymers, 2020, 33(5): 473-482. doi: 10.14133/j.cnki.1008-9357.20191230001

    Preparation and Properties of Novel Sulfonated Poly(ether ketone benzimidazole) Copolymers for Fuel Cells

    • An ortho-diamine monomer, 4-phenoxy-1,2-phenylenediamine (POPDA), was synthesized via two-step reactions. It was randomly copolymerized with 4,4’-dicarboxydiphenyl ether (DCDPE), 5-aminoisophthalic acid (APA) and 3,3’-diaminobenzidine (DAB) in polyphosphoric acid to yield a new kind of high molecular weight poly(ether ketone benzimidazole) copolymers (PEKBI-x, ‘x’ refers to the molar fraction of POPDA in aromatic diamines (POPDA and DAB). The resultant PEKBI-x was sulfonated using fuming sulfuric acid as the sulfonating reagent to give the corresponding sulfonated poly(ether ketone benzimidazole)s (SPEKBI-x). No significant polymer degradation was observed during the process of sulfonation reaction indicating excellent chemical stability of the copolymers PEKBI-x. A series of covalently cross-linked membranes (SPEKBI-x-CL) were prepared via the solution cast method, and the cross-linking reaction occurred between the amino groups of the APA moiety of the SPEKBI-x and the epoxy groups of the cross-linker 1,2,7,8-diepoxyoctane during the process of solvent evaporation. The thermal stability, mechanical properties, water uptake, swelling ratio, proton conductivity, ion exchange capacity, radical stability, and single cell performance of the exchange proton membranes were investigated. Results showed that these cross-linked membranes exhibited very high ion exchange capacities (2.88~3.28 meq/g) and good mechanical and thermal properties. With the increase of POPDA content in the copolymers, the proton conductivity of the proton exchange membrane increased. A preliminary test of H2-O2 single cell revealed that the maximum output power density of the single cell assembled with the SPEKBI-0.50-CL membrane reached 662 mW/cm2 at 80 ℃, 80% relative humidity and 100 kPa back pressure, which was slightly higher than that of the one assembled with Nafion212 (631 mW/cm2) under the same test conditions.
    • loading

    Catalog

      /

      DownLoad:  Full-Size Img  PowerPoint
      Return
      Return