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dc.contributor.authorVaughan, Benjamin Rayen_US
dc.date.accessioned2014-03-14T20:09:47Z
dc.date.available2014-03-14T20:09:47Z
dc.date.issued2007-04-03en_US
dc.identifier.otheretd-04162007-233204en_US
dc.identifier.urihttp://hdl.handle.net/10919/26908
dc.description.abstractIt is well known that clays dispersed in a polymer matrix decrease the permeability of all gases through that membrane. Our objective was to explore the effects on transport when a microporous layered aluminophosphate was added to a polymer matrix. The clay like layered aluminophosphate used contains sheets with 8MR ring openings in the size range of 3-4 Ã . The molecular level dispersion of this material into a polymer matrix is theorized to increase selectivity by molecular sieving. A previous study performed in our laboratory showed an increase in He/CH4 selectivity when this aluminophosphate (8MR-AlPO) was dispersed in a fluorinated polyimide. The increase in selectivity was explained as size sieving by the aluminophosphate sheets where small gas species can pass through the microstructure and large gas species have to take a tortuous path around the sheets. We performed several studies with different polymer materials in the attempt to make composite membranes that corroborated the previously seen increases in gas selectivity. In some cases different surfactants were used to swell 8MR-AlPO. In the first set of studies the methods used to produce the fluorinated polyimide composites were repeated using polydimethyl siloxane (PDMS), a copolymer of a fluorinated polyimide and PDMS, polysulfone, Matrimid, and cellulose acetate as the matrix materials. In general gas permeation studies of these materials showed an overall decrease in permeability with increasing addition of 8MR-AlPO but no substantial increase in selectivity. In an attempt to increase the chances of exfoliating and dispersing the layered aluminophosphate, an in-situ method using poly(etherimide) (PEI) was polymerized in the presence of 8MR-AlPO was employed. Mixed matrix membranes of PEI with 5wt% 8MR-AlPO were successfully fabricated and the transport properties measured. Microscopy revealed that the composites made with the 8MR-AlPO treated with a reactive surfactant showed better dispersion than those treated with the nonreactive surfactants. The permeability of gases changed very little as the result of adding 8MR-AlPO to PEI and no substantial increase in selectivity was observed. Finally, we incorporated a similar layered aluminophosphate with larger 12MR (6-7Ã ) openings into polysulfone. These composites showed barrier behavior but no increases in selectivity.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartcombined.pdfen_US
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectlayered aluminophosphatesen_US
dc.subjectmixed matrix membranesen_US
dc.subjectgas separationsen_US
dc.titlePolymer Aluminophosphate Mixed Matrix Membranes for Gas Separationsen_US
dc.typeDissertationen_US
dc.contributor.departmentChemical Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineChemical Engineeringen_US
dc.contributor.committeechairMarand, Evaen_US
dc.contributor.committeememberKoros, Williamen_US
dc.contributor.committeememberDavis, Richey M.en_US
dc.contributor.committeememberOyama, Shigeo Teden_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04162007-233204/en_US
dc.date.sdate2007-04-16en_US
dc.date.rdate2007-04-24
dc.date.adate2007-04-24en_US


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