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Molecular Design of High-Performance Imidazolium Ionenes as Gas Separation Membranes and 3D Printing Materials

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dc.contributorWujcik, Evan
dc.contributorTurner, C Heath
dc.contributorRupar, Paul
dc.contributorWeinman, Steven
dc.contributor.advisorBara, Jason E.
dc.contributor.authorO'Harra, Kathryn Elizabeth
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2021-11-23T14:33:55Z
dc.date.available2021-11-23T14:33:55Z
dc.date.issued2021
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractThis dissertation details the development and performance of a library of imidazolium ionenes for advanced engineering applications, with an emphasis on membrane-based gas separations and additive manufacturing. Several distinct sets of high-performance ionenes, polymers which contain ionic groups along the backbone chain rather than as pendants, were methodically designed and synthesized. These materials combine structural features commonly associated with state-of-the-art gas-separation membranes with chemical functionalities associated with high-performance engineering polymers. These functional features are spaced by incorporated ionic groups along the main chain, specifically imidazolium cations paired with fluorinated, delocalized anions. The modular synthetic methods and diverse processability of these new ionenes demonstrate that the rational design of materials can lead to enhanced performance and unique properties and behaviors. Through variation of substituents, connectivity along the backbone, and the sequence of functional and ionic segments, this work demonstrates the expansive opportunities for incorporating, distributing, and alternating structural features. These ionenes possess excellent thermal and mechanical properties, while the tailorability and synthetic modularity ionenes provide access to an array of interesting behaviors and molecular architectures. These ionic polymers materials exhibit self-assembly and local structuring when impregnated with “free” imidazolium-based ionic liquids (IL) or multivalent organic salts, which contributes additional tunability and alters intermolecular interactions in the ionene matrix. These HP-ionenes and IL composites were thoroughly characterized to develop structure-property relationships and to understand the coordination between the dispersed, discrete additives and the polymeric ionene matrix. Using the information gathered from characterization of these ionenes and IL composites, the specific suitability of processing techniques for each series of functional imidazolium ionenes was explored, yielding applied studies of these advanced materials as films/coatings, fibers, 3D printing resins, and self-healing elastomers.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otherhttp://purl.lib.ua.edu/181465
dc.identifier.otheru0015_0000001_0003904
dc.identifier.otherOHarra_alatus_0004D_14561
dc.identifier.urihttp://ir.ua.edu/handle/123456789/8136
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subject3D Printing
dc.subjectCarbon Dioxide
dc.subjectIonic Liquids
dc.subjectIonic Polymers
dc.subjectMembranes
dc.subjectSeparations
dc.titleMolecular Design of High-Performance Imidazolium Ionenes as Gas Separation Membranes and 3D Printing Materialsen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Chemical and Biological Engineering
etdms.degree.disciplineMaterials Science
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.

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