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Fabrication and characterization of poly(amide-imides)/TiO₂ nanocomposite gas separation membranes

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dc.contributor.authorHu, Qingchunen
dc.contributor.committeechairMarand, Evaen
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.committeememberKander, Ronald G.en
dc.contributor.committeememberMarand, Hervé L.en
dc.contributor.committeememberWilkes, Garth L.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T21:19:32Zen
dc.date.adate2008-10-02en
dc.date.available2014-03-14T21:19:32Zen
dc.date.issued1996-10-15en
dc.date.rdate2008-10-02en
dc.date.sdate2008-10-02en
dc.description.abstractNanosized Ti0₂ rich domains were generated in-situ within poly(amide-imide) (PAl) and 6F-poly(amide-imide) (6FPAl) by a sol-gel process. The composite films showed a high optical transparency. The morphology of the Ti0₂ rich domains was observed by transmission electron microscopy (TEM). The Ti0₂ rich domains were well dispersed within the poly(amide-imide) and 6F-poly(amide-imide) matrices and were 5 nm to 50 nm in size. Limited study was also carried out for the fabrication of the P AI/Si0₂ and PAI/fi0₂-Si0₂ composites. It was found that nanosized Si0₂ rich domains were difficult to form within the poly(amide-imide) matrix, although the Si0₂ could be bonded with the Ti0₂, forming nanosized domains within the poly(amide-imide) matrix. The PAI/Ti0₂ composites showed an increased glass transition temperature, and an increased rubbery plateau modulus, in comparison to the unfilled poly(amide-imide). Wide Angle X- ray Diffraction (W AXD) study and Differential Scanning Calorimetry (DSC) analysis suggest that the Ti0₂ filled poly( amide-imide) have a lower crystallinity as compared to the unfilled poly(amide-imide). The dynamic mechanical properties in rubbery regions suggest that Ti0₂ domains function as physical crosslinks, increasing the rubbery plateau modulus with increasing Ti0₂ content. This behavior can be explained by the theory of rubbery elasticity. The actual formation of the nanosized Ti0₂ and Ti0₂-Si0₂ rich domains was explained in terms of hydrogen bonding effects between the polymer, the solvent and the inorganic components.en
dc.description.degreePh. D.en
dc.format.extentxvi, 214 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10022008-063009en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10022008-063009/en
dc.identifier.urihttp://hdl.handle.net/10919/39534en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1996.H8.pdfen
dc.relation.isformatofOCLC# 36678648en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpolymeren
dc.subjectmetal oxideen
dc.subjectcompositeen
dc.subjectsol-gelen
dc.subjectgas separationen
dc.subjectmembraneen
dc.subject.lccLD5655.V856 1996.H8en
dc.titleFabrication and characterization of poly(amide-imides)/TiO₂ nanocomposite gas separation membranesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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