{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/138955"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/138955","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations","abstract":"In Chapter 1, we incorporate functional groups in triptycene-containing poly aryl ethers to serve a variety of applications. Amine-functionalized polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based gas sensing. Pyrazolium-functionalized polymers are fabricated into anion-exchange membranes. In Chapter 2, we design a set of two- and three-component polyurethanes to elucidate the influence of molecular composition on thermal transition characteristics, crystallinity, segmental dynamics of PTMO, as well as high-strain-rate impact response. In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild substitution conditions provide broad functional group tolerance, constituting a versatile postpolymerization modification platform with access to a diversity of polyureas and polythiocarbamates. In Chapter 4, we seek to synthesize a dibenzobarrelene-elaborated polyacetylene, whereby the dibenzobarrelene groups can provide stability by steric shielding, as well as a site for attaching solubilizing and functional groups. Routes based on dehydrogenation, bromination–elimination, sulfoxide elimination, and reductive defluorination are discussed. In Chapter 5, we study a family of bottlebrush polymers that consist of a flexible backbone with rigid, porogenic side chains. Tuning of side-chain length and dispersity, as well as incorporation of new functional groups, are performed to elucidate structure–property relationships and to enable improvements in selectivity.","abstract_html":"In Chapter 1, we incorporate functional groups in triptycene-containing poly aryl ethers to serve a variety of applications. Amine-functionalized polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based gas sensing. Pyrazolium-functionalized polymers are fabricated into anion-exchange membranes. In Chapter 2, we design a set of two- and three-component polyurethanes to elucidate the influence of molecular composition on thermal transition characteristics, crystallinity, segmental dynamics of PTMO, as well as high-strain-rate impact response. In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild substitution conditions provide broad functional group tolerance, constituting a versatile postpolymerization modification platform with access to a diversity of polyureas and polythiocarbamates. In Chapter 4, we seek to synthesize a dibenzobarrelene-elaborated polyacetylene, whereby the dibenzobarrelene groups can provide stability by steric shielding, as well as a site for attaching solubilizing and functional groups. Routes based on dehydrogenation, bromination–elimination, sulfoxide elimination, and reductive defluorination are discussed. In Chapter 5, we study a family of bottlebrush polymers that consist of a flexible backbone with rigid, porogenic side chains. Tuning of side-chain length and dispersity, as well as incorporation of new functional groups, are performed to elucidate structure–property relationships and to enable improvements in selectivity.","abstract_has_math":false,"creators":["Wu, You-Chi"],"institution":"Massachusetts Institute of Technology","degree_name":"Doctoral","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Chemistry","school":null,"contributors":[],"advisors":["Swager, Timothy M."],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-06","date_published":"2021-06","updated_at":"2026-07-22T22:21:48Z","subjects":[],"languages":[],"rights":["In Copyright - Educational Use Permitted","Copyright MIT"],"rights_urls":["http://rightsstatements.org/page/InC-EDU/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1721.1/138955","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Swager, Timothy M."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. 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Amine-functionalized polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based gas sensing. Pyrazolium-functionalized polymers are fabricated into anion-exchange membranes. In Chapter 2, we design a set of two- and three-component polyurethanes to elucidate the influence of molecular composition on thermal transition characteristics, crystallinity, segmental dynamics of PTMO, as well as high-strain-rate impact response. In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild substitution conditions provide broad functional group tolerance, constituting a versatile postpolymerization modification platform with access to a diversity of polyureas and polythiocarbamates. In Chapter 4, we seek to synthesize a dibenzobarrelene-elaborated polyacetylene, whereby the dibenzobarrelene groups can provide stability by steric shielding, as well as a site for attaching solubilizing and functional groups. Routes based on dehydrogenation, bromination–elimination, sulfoxide elimination, and reductive defluorination are discussed. In Chapter 5, we study a family of bottlebrush polymers that consist of a flexible backbone with rigid, porogenic side chains. Tuning of side-chain length and dispersity, as well as incorporation of new functional groups, are performed to elucidate structure–property relationships and to enable improvements in selectivity."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:title","label":"Title","values":["Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations"]}]}],"canonical_facts":{"dc:contributor.advisor":["Swager, Timothy M."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Chemistry"],"dc:creator":["Wu, You-Chi"],"dc:date.accessioned":["2022-01-14T14:40:34Z"],"dc:date.available":["2022-01-14T14:40:34Z"],"dc:date.issued":["2021-06"],"dc:description.abstract":["In Chapter 1, we incorporate functional groups in triptycene-containing poly aryl ethers to serve a variety of applications. Amine-functionalized polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based gas sensing. Pyrazolium-functionalized polymers are fabricated into anion-exchange membranes. In Chapter 2, we design a set of two- and three-component polyurethanes to elucidate the influence of molecular composition on thermal transition characteristics, crystallinity, segmental dynamics of PTMO, as well as high-strain-rate impact response. In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild substitution conditions provide broad functional group tolerance, constituting a versatile postpolymerization modification platform with access to a diversity of polyureas and polythiocarbamates. In Chapter 4, we seek to synthesize a dibenzobarrelene-elaborated polyacetylene, whereby the dibenzobarrelene groups can provide stability by steric shielding, as well as a site for attaching solubilizing and functional groups. Routes based on dehydrogenation, bromination–elimination, sulfoxide elimination, and reductive defluorination are discussed. In Chapter 5, we study a family of bottlebrush polymers that consist of a flexible backbone with rigid, porogenic side chains. Tuning of side-chain length and dispersity, as well as incorporation of new functional groups, are performed to elucidate structure–property relationships and to enable improvements in selectivity."],"dc:description.degree":["Ph.D."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/138955"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright MIT"],"dc:rights.uri":["http://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations"],"dc:type":["Thesis"],"thesis:degree_name":["Doctoral","Doctor of Philosophy"]},"updated_at":"2026-07-22T22:21:48Z"}