{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/102851"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/102851","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Determining the role of charges in ionic polymer blend systems","abstract":"Little is known experimentally about the effect of charge in ionic multi-polymeric systems. Theory has shown that many charged systems have unusual phase diagrams that are asymmetric. Such a phenomenon would be ideal for tuning domain sizes or obtaining nontraditional structures in materials. One of the two studies presented in this thesis focuses on the crystallization kinetics in a crystalline-crystalline polymer blend, to better understand how to tune the number density and size of crystalline domains in crystalline-crystalline and crystalline-amorphous polymer blends. The blend system’s miscibility, kinetics, and final structures were studied at different compositions and compared to the homopolymers via differential scanning calorimetry (DSC), polarized optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but crystallize at much lower temperatures (at least a 20°C shift) due to slower kinetics. The blend kinetics were studied quantitatively via POM spherulite measurements over time and agreed with DSC data. GI-WAXS showed that the blends displayed crystalline features from both the individual components. The second study presented in this thesis focuses on amorphous charged blends. The blends are comprised of a plus-neutral polymer for high ionic selectivity, and poly(2-vinylpyridine) (P2VP) for mechanic integrity. Under proper processing conditions, the blend system was found to be at least partially miscible from being visually transparent and from having observed shifts of two glass transition temperatures inwards from those of the individual homopolymers. Preliminary conductivity data showed a decrease of at least four orders of magnitude when 50 wt% P2VP was added. For membrane applications, the trade-off between good mechanical properties and high ionic selectivity is yet to be optimized.","abstract_html":"Little is known experimentally about the effect of charge in ionic multi-polymeric systems. Theory has shown that many charged systems have unusual phase diagrams that are asymmetric. Such a phenomenon would be ideal for tuning domain sizes or obtaining nontraditional structures in materials. One of the two studies presented in this thesis focuses on the crystallization kinetics in a crystalline-crystalline polymer blend, to better understand how to tune the number density and size of crystalline domains in crystalline-crystalline and crystalline-amorphous polymer blends. The blend system’s miscibility, kinetics, and final structures were studied at different compositions and compared to the homopolymers via differential scanning calorimetry (DSC), polarized optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but crystallize at much lower temperatures (at least a 20°C shift) due to slower kinetics. The blend kinetics were studied quantitatively via POM spherulite measurements over time and agreed with DSC data. GI-WAXS showed that the blends displayed crystalline features from both the individual components. The second study presented in this thesis focuses on amorphous charged blends. The blends are comprised of a plus-neutral polymer for high ionic selectivity, and poly(2-vinylpyridine) (P2VP) for mechanic integrity. Under proper processing conditions, the blend system was found to be at least partially miscible from being visually transparent and from having observed shifts of two glass transition temperatures inwards from those of the individual homopolymers. Preliminary conductivity data showed a decrease of at least four orders of magnitude when 50 wt% P2VP was added. For membrane applications, the trade-off between good mechanical properties and high ionic selectivity is yet to be optimized.","abstract_has_math":false,"creators":["Huang, Jennifer"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Evans, Christopher"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-02-07T20:44:27Z","date_published":"2019-02-07T20:44:27Z","updated_at":"2026-07-22T22:24:42Z","subjects":["ionic polymer blends, miscibility, crystalline, kinetics, amorphous, conductivity"],"languages":["en"],"rights":["Copyright 2018 Jennifer Huang"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/102851","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Evans, Christopher"]},{"key":"dc:creator","label":"Author","values":["Huang, Jennifer"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-02-07T20:44:27Z","2021-02-08T10:15:36Z","2018-12-10","2018-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["ionic polymer blends, miscibility, crystalline, kinetics, amorphous, conductivity"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Jennifer Huang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/102851"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Little is known experimentally about the effect of charge in ionic multi-polymeric systems. Theory has shown that many charged systems have unusual phase diagrams that are asymmetric. Such a phenomenon would be ideal for tuning domain sizes or obtaining nontraditional structures in materials. One of the two studies presented in this thesis focuses on the crystallization kinetics in a crystalline-crystalline polymer blend, to better understand how to tune the number density and size of crystalline domains in crystalline-crystalline and crystalline-amorphous polymer blends. The blend system’s miscibility, kinetics, and final structures were studied at different compositions and compared to the homopolymers via differential scanning calorimetry (DSC), polarized optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but crystallize at much lower temperatures (at least a 20°C shift) due to slower kinetics. The blend kinetics were studied quantitatively via POM spherulite measurements over time and agreed with DSC data. GI-WAXS showed that the blends displayed crystalline features from both the individual components. The second study presented in this thesis focuses on amorphous charged blends. The blends are comprised of a plus-neutral polymer for high ionic selectivity, and poly(2-vinylpyridine) (P2VP) for mechanic integrity. Under proper processing conditions, the blend system was found to be at least partially miscible from being visually transparent and from having observed shifts of two glass transition temperatures inwards from those of the individual homopolymers. Preliminary conductivity data showed a decrease of at least four orders of magnitude when 50 wt% P2VP was added. For membrane applications, the trade-off between good mechanical properties and high ionic selectivity is yet to be optimized.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01","The student, Jennifer Huang, accepted the attached license on 2018-12-10 at 11:30.","The student, Jennifer Huang, submitted this Thesis for approval on 2018-12-10 at 11:41.","This Thesis was approved for publication on 2018-12-10 at 15:17.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13267 on 2019-02-07 at 14:23:12","Made available in DSpace on 2019-02-07T20:44:27Z (GMT). No. of bitstreams: 3 HUANG-THESIS-2018.pdf: 15441458 bytes, checksum: 5d9d497ad56596febf64b2ef085a4f58 (MD5) masters-thesis-v4.doc: 15254528 bytes, checksum: 6a66c2596aa940d0a2c9722727817196 (MD5) LICENSE.txt: 4211 bytes, checksum: a6333d681445bb580314941699853a05 (MD5) Previous issue date: 2018-12-10","Embargo set by: Seth Robbins for item 109877 Lift date: 2021-02-07T20:44:35Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 109877 on 2021-02-08T10:15:36Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Determining the role of charges in ionic polymer blend systems"]}]}],"canonical_facts":{"dc:contributor":["Evans, Christopher"],"dc:creator":["Huang, Jennifer"],"dc:date":["2019-02-07T20:44:27Z","2021-02-08T10:15:36Z","2018-12-10","2018-12"],"dc:description":["Little is known experimentally about the effect of charge in ionic multi-polymeric systems. Theory has shown that many charged systems have unusual phase diagrams that are asymmetric. Such a phenomenon would be ideal for tuning domain sizes or obtaining nontraditional structures in materials. One of the two studies presented in this thesis focuses on the crystallization kinetics in a crystalline-crystalline polymer blend, to better understand how to tune the number density and size of crystalline domains in crystalline-crystalline and crystalline-amorphous polymer blends. The blend system’s miscibility, kinetics, and final structures were studied at different compositions and compared to the homopolymers via differential scanning calorimetry (DSC), polarized optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but crystallize at much lower temperatures (at least a 20°C shift) due to slower kinetics. The blend kinetics were studied quantitatively via POM spherulite measurements over time and agreed with DSC data. GI-WAXS showed that the blends displayed crystalline features from both the individual components. The second study presented in this thesis focuses on amorphous charged blends. The blends are comprised of a plus-neutral polymer for high ionic selectivity, and poly(2-vinylpyridine) (P2VP) for mechanic integrity. Under proper processing conditions, the blend system was found to be at least partially miscible from being visually transparent and from having observed shifts of two glass transition temperatures inwards from those of the individual homopolymers. Preliminary conductivity data showed a decrease of at least four orders of magnitude when 50 wt% P2VP was added. For membrane applications, the trade-off between good mechanical properties and high ionic selectivity is yet to be optimized.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01","The student, Jennifer Huang, accepted the attached license on 2018-12-10 at 11:30.","The student, Jennifer Huang, submitted this Thesis for approval on 2018-12-10 at 11:41.","This Thesis was approved for publication on 2018-12-10 at 15:17.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13267 on 2019-02-07 at 14:23:12","Made available in DSpace on 2019-02-07T20:44:27Z (GMT). No. of bitstreams: 3 HUANG-THESIS-2018.pdf: 15441458 bytes, checksum: 5d9d497ad56596febf64b2ef085a4f58 (MD5) masters-thesis-v4.doc: 15254528 bytes, checksum: 6a66c2596aa940d0a2c9722727817196 (MD5) LICENSE.txt: 4211 bytes, checksum: a6333d681445bb580314941699853a05 (MD5) Previous issue date: 2018-12-10","Embargo set by: Seth Robbins for item 109877 Lift date: 2021-02-07T20:44:35Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 109877 on 2021-02-08T10:15:36Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/102851"],"dc:language":["en"],"dc:rights":["Copyright 2018 Jennifer Huang"],"dc:subject":["ionic polymer blends, miscibility, crystalline, kinetics, amorphous, conductivity"],"dc:title":["Determining the role of charges in ionic polymer blend systems"],"dc:type":["text"],"thesis:degree_discipline":["Materials Science & Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:42Z"}