Studies on the application of aniline-formaldehyde derivatives as the solid-state electrolyte membrane for high concentration methanol fuel of DMFC

• Main Authors: Ching-Nan Chuang, 莊清男
• Other Authors: Ko-Shan Ho
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/03510371268177759112

碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 95 === Conventional membranes such as Nafion suffer from the swelling and methanol crossover problems under high methanol concentration fuel stream. More durable proton exchange membrane (PEM) has received increasing interests from academic and industrial researchs for direct methanol fuel cell (DMFC) application. The propose of this study was to synthesis of a Novel Proton Exchange Membrane (PEM) by condensation polymerization : p-toluidine formaldehyde resin (PTF) and to replace Nafion which has poor proton conductivity at high temperature. Then p-toluidine formaldehyde resin with the best the proton conductivity was blended with polyurethane to form a polyblend film which can be used to prevent methanol crossover and improve the mechanical properties. First, the synthesis of a PTF resin was described and the effects of molar ratio of the individual monomers and polymerization conditions on the structure of PTF resin were studied. The structure surface morphology、molecular weight 、structure and ion transport of PTF are characterized by FT-IR、13C NMR、XRD、SEM、AC-impedance experiments, respectively. Second, The structure surface morphology、thermal stability、molecular motion ability and state、structure and ion transport of PTF blended with PU are characterized、methanol cross-over、mechanical properties by SEM、AC-impedance experiments、AFM、GC、TGA、DSC、DMA、IEC. Primary results illustrate that the PTF prepared with different polymerization conditions came upwith various morphologies with different proton conductivity. AC-impedance and Environmental Chamber illustrate that the PTF has the highest proton conductivity when prepared measured in excess surfuric acid and excess formaldehyde. And proton conductivity of PTF measured at 90~100℃ of 0 % RH has similarity value with that measured at RT ( 25℃, 70% RH ). Secondarily the coperdence of PTF and PU prepolymer ratros on the proton conductivity were studied. The results illustrate that the proton conductivity is highly dependet on blended ratio of PTF-FA. And it was found that proton conductivity of PTF/prepolymer compound measured at 90~100℃ of 0 % RH is similar to that when measured at 25℃, 70% RH. The presence of proton qalleries was found by AFM and FE-SEM confirmed the high proton conductivity of PTF-FA.