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dc.contributor.advisorSuleiman-Rosado, David
dc.contributor.authorMarrero-Meléndez, Alba Y.
dc.description.abstractThe present work has processed Nafion® and sulfonated polystyrene-isobutylenestyrene (SIBS) with supercritical fluid (SCF) carbon dioxide at a 40°C and 200 bar with the aid of ten co-solvents of different size and polarity. The goal of the investigation was to morphologically re-arrange the sulfonic acid groups to maintain the proton conductivity, while also re-arranging the CO2-phillic perfluorinated groups to block the methanol for crossing over. Measured ion exchange capacities (IEC) of the processed samples showed an increase, supporting our hypothesis, but very sensitive to the co-solvent selected. In addition, density results confirmed the membrane integrity. The last stage of this investigation has been studying the proton conductivity to have a better description of the orientation arrangement of the molecules. These results coupled with thermogravimetric, swelling, and dynamic mechanical analysis can provide a better picture of the structure property relation of these complex heterogeneous polymers.en_US
dc.subjectSupercritical fluid processingen_US
dc.subjectProton conductivityen_US
dc.subject.lcshProton exchange membrane fuel cells.en_US
dc.subject.lcshIon exchange.en_US
dc.subject.lcshSupercritical fluids.en_US
dc.subject.lcshSeparation (Technology)en_US
dc.titlePerfluorinated and sulfonated proton exchange membranes: Effect of supercritical fluid processing on ion exchange capacity and proton conductivityen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2007 Alba Y. Marrero Meléndezen_US
dc.contributor.committeeTorres, Madeline
dc.contributor.committeeVelázquez, Carlos
dc.contributor.representativeCruz Pol, Astrid Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Chemical Engineeringen_US

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