{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115466"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115466","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Understanding molecular aspects of mass transport in charged and uncharged dense polymer networks","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms","abstract_has_math":false,"creators":["Sheridan, Grant S."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Evans, Christopher M","Schweizer, Kenneth S","Braun, Paul V","Sing, Charles E"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:54Z","subjects":["polymer","polymer physics","diffusion"],"languages":["en","eng"],"rights":["Copyright 2022 Grant Sheridan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115466","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Evans, Christopher M","Schweizer, Kenneth S","Braun, Paul V","Sing, Charles E"]},{"key":"dc:creator","label":"Author","values":["Sheridan, Grant S."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-05","2022-04-21"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["polymer","polymer physics","diffusion"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2022 Grant Sheridan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115466"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms","The student, Grant Sheridan, accepted the attached license on 2022-04-15 at 11:33.","The student, Grant Sheridan, submitted this Dissertation for approval on 2022-04-15 at 11:45.","This Dissertation was approved for publication on 2022-04-21 at 13:23.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17703 on 2022-11-11 at 13:15:20","Polymer membranes are the future of separation, providing an energy efficient means of separation. Glassy polymer membranes have typically held the advantage over rubbery polymer membranes due to their higher selectivity; however, the work of this thesis aims to develop a molecular understanding of mass transport in dense rubbery polymer membranes to inspire the next generation of rubbery polymer membranes that can separate compounds based on size exclusion, combining the high permeability of rubbery polymer membranes with the high selectivity of glassy polymers. Imidazolium ionic liquid membranes were developed with varying ionic liquid moiety and crosslink density for the separation of toluene and heptane. TFSI- ionic liquid moieties showed improved toluene-heptane separation performance over their BF4- counterparts. Decreasing the crosslink density of the TFSI- polymerized ionic liquid membranes also led to a non-monotonic trend in permselectivity. The effect of crosslink density on mass transport was further investigated via probe diffusion in butyl acrylate polymer networks, where crosslinking significantly increased the glass transition temperature, reduced segmental dynamics, and reduced probe diffusion. Probe diffusion compared to segmental relaxation times revealed diffusion partially decoupled from segmental dynamics, where varying probe size led to a difference in diffusivity that could be accounted for by the inscribed probe volume. These results provide new insights regarding the effect of covalent crosslinks on probe diffusion necessary for the design and development of separation membranes."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Understanding molecular aspects of mass transport in charged and uncharged dense polymer networks"]}]}],"canonical_facts":{"dc:contributor":["Evans, Christopher M","Schweizer, Kenneth S","Braun, Paul V","Sing, Charles E"],"dc:creator":["Sheridan, Grant S."],"dc:date":["2022-05","2022-04-21"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms","The student, Grant Sheridan, accepted the attached license on 2022-04-15 at 11:33.","The student, Grant Sheridan, submitted this Dissertation for approval on 2022-04-15 at 11:45.","This Dissertation was approved for publication on 2022-04-21 at 13:23.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17703 on 2022-11-11 at 13:15:20","Polymer membranes are the future of separation, providing an energy efficient means of separation. Glassy polymer membranes have typically held the advantage over rubbery polymer membranes due to their higher selectivity; however, the work of this thesis aims to develop a molecular understanding of mass transport in dense rubbery polymer membranes to inspire the next generation of rubbery polymer membranes that can separate compounds based on size exclusion, combining the high permeability of rubbery polymer membranes with the high selectivity of glassy polymers. Imidazolium ionic liquid membranes were developed with varying ionic liquid moiety and crosslink density for the separation of toluene and heptane. TFSI- ionic liquid moieties showed improved toluene-heptane separation performance over their BF4- counterparts. Decreasing the crosslink density of the TFSI- polymerized ionic liquid membranes also led to a non-monotonic trend in permselectivity. The effect of crosslink density on mass transport was further investigated via probe diffusion in butyl acrylate polymer networks, where crosslinking significantly increased the glass transition temperature, reduced segmental dynamics, and reduced probe diffusion. Probe diffusion compared to segmental relaxation times revealed diffusion partially decoupled from segmental dynamics, where varying probe size led to a difference in diffusivity that could be accounted for by the inscribed probe volume. These results provide new insights regarding the effect of covalent crosslinks on probe diffusion necessary for the design and development of separation membranes."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115466"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Grant Sheridan"],"dc:subject":["polymer","polymer physics","diffusion"],"dc:title":["Understanding molecular aspects of mass transport in charged and uncharged dense polymer networks"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Materials Science & Engr"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:54Z"}