Synthesis and Characterization of Sulfonated Poly(phthalazinone ether sulfone)(sPPES)/Silica Membrane for Proton Exchange Membrane Materials

  • Kim, Dae Sik (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University) ;
  • Park, Ho Bum (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University) ;
  • Nam, Sang Young (Department of Polymer Science and Engineering, Gyeongsang National University, Engineering Research Institute) ;
  • Rhim, Ji Won (Department of Chemical Engineering Hannam University) ;
  • Lee, Young Moo (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University)
  • Published : 2004.12.01

Abstract

Organic-inorganic composite membranes based on sulfonated poly(phthalazinone ether sulfone) (sPPES)/silica hybrid were prepared using the sol-gel process under acidic conditions. The sulfonation of PPES with concentrated sulfuric acid as sulfonation agent was carried out to prepare proton exchange membrane material. The behaviors of the proton conductivity and methanol permeability are depended on the sulfonation time (5-100 hr). The hybrid membranes composed of highly sulfonated PPES (IEC value: 1.42 meq./g) and silica were fabricated from different silica content (5-20 wt%) in order to achieve desirable proton conductivity and methanol permeability demanded for fuel cell applications. The silica particles within membranes were used for the purpose of blocking excessive methanol cross-over and for forming the path way to transport of the proton due to absorbing water molecules with ≡SiOH on silica. The presence of silica particles in the organic polymer matrix results in hybrid membranes with reduced methanol permeability and improved proton conductivity.

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