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D-31 : Characterization of Proton Exchange Membranes Modified with a Base Polymer for use in DMFC
배병찬,하흥용,김덕준 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
A base monomer (1-vinyl imidazole, VIDz) was polymerized in the Nafion 112 membrane by UV irradiation in order to reduce methanol permeability. Small angle X-ray scattering analysis revealed that the size of hydrated ion cluster in the composite Nafion membranes was reduced and equilibrium water uptakes from liquid and vapor water were decreased with increasing VIDz content of the membrane. The transport properties such as ion conductivity, methanol permeability and electroosmotic drag were also affected by equilibrium water uptake and hydrated pore size. Even a little incorporation of base polymer showed a significant effect on proton conductivity and methanol permeability. Electro-osmotic drag of methanol was evaluated by using ex-situ methanol permeability test and in-situ limiting current density measurement. Although it was not easy to obtain the absolute number of methanol transported by electro-osmotic drag, it was possible to correlate the electro-osmotic drag of methanol with the state of water present in the composite membrane. The composite membrane with an optimum amount of VIDz was found to increase DMFC performance higher than that of Nafion membrane because of reduced methanol permeability and electro-osmotic drag effect.
저가습연료전지 운전을 위한 술폰산화 멀티블록고분자 전해질막의 개발
배병찬 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
Novel sulfonated poly(arylene ether sulfone)s multi-block copolymer membranes containing highly sulfonated hydrophilic blocks were synthesized. Different local concentration of sulfonic acid in their hydrophilic blocks affected chemical and physical properties of the SPAES. To investigate the effects of chemical composition on their membrane properties, different hydrophilic oligomers sharing same hydrophobic blocks gave us exact comparison of effect of hydrophilic blocks. The higher concentration of sulfonic acid groups resulted in higher proton conductivity under certain relative humidity conditions than that of the state-of-the-art perfluorinated sulfonic acid membrane and showed that the well-developed phase separation of SPAES.