{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/29440"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/29440","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Particle microstructure and polymer dynamics in concentrated polymer solutions","abstract":"The states of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with varying (i) polymer concentration, (ii) solvent type, (iii) temperature, (iv) particle volume fraction and (v) polymer chemistry while polymer-to-solvent volume ratio is held between 0.45 and 1. The local order and long wave length concentration fluctuations of nanoparticles are obtained from the analysis of scattering structure factors and compared with the Polymer Reference Site Interaction Model (PRISM) theory. Exploiting contrast matching small-angle neutron scattering all partial collective structure factors of particles, polymers and their interface are characterized establishing the existence and size of adsorbed polymer layers. Comparisons of experimental structure factors to PRISM predictions yield a key parameter, the polymer segment-nanoparticle attractive contact interaction energy. This cohesive energy controls the state of particle and polymer dispersions. The thermodynamic information obtained in these experiments is linked to the polymer dynamics using free induction decay of NMR experiments, which directly quantify the amount of polymer adsorption while multi-quantum NMR experiments probe the existence of physical crosslinks and entanglements. Taken together this thesis provides detailed information of nanoparticle dispersions in dense polymer solutions and polymer nanocomposites and insight into how to manipulate particles and polymer to control particle aggregation.","abstract_html":"The states of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with varying (i) polymer concentration, (ii) solvent type, (iii) temperature, (iv) particle volume fraction and (v) polymer chemistry while polymer-to-solvent volume ratio is held between 0.45 and 1. The local order and long wave length concentration fluctuations of nanoparticles are obtained from the analysis of scattering structure factors and compared with the Polymer Reference Site Interaction Model (PRISM) theory. Exploiting contrast matching small-angle neutron scattering all partial collective structure factors of particles, polymers and their interface are characterized establishing the existence and size of adsorbed polymer layers. Comparisons of experimental structure factors to PRISM predictions yield a key parameter, the polymer segment-nanoparticle attractive contact interaction energy. This cohesive energy controls the state of particle and polymer dispersions. The thermodynamic information obtained in these experiments is linked to the polymer dynamics using free induction decay of NMR experiments, which directly quantify the amount of polymer adsorption while multi-quantum NMR experiments probe the existence of physical crosslinks and entanglements. Taken together this thesis provides detailed information of nanoparticle dispersions in dense polymer solutions and polymer nanocomposites and insight into how to manipulate particles and polymer to control particle aggregation.","abstract_has_math":false,"creators":["Kim, So Youn"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":["Zukoski, Charles F.","Schroeder, Charles M.","Kenis, Paul J.A.","Schweizer, Kenneth S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-02-01T00:46:32Z","date_published":"2012-02-01T00:46:32Z","updated_at":"2026-07-22T22:25:27Z","subjects":["nanoparticle dispersion","particle microstructure","polymer solution","nanocomposites"],"languages":["en"],"rights":["Copyright 2011 So Youn Kim"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/29440","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Zukoski, Charles F.","Schroeder, Charles M.","Kenis, Paul J.A.","Schweizer, Kenneth S."]},{"key":"dc:creator","label":"Author","values":["Kim, So Youn"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-02-01T00:46:32Z","2014-02-01T11:00:26Z","2011-12"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"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":["nanoparticle dispersion","particle microstructure","polymer solution","nanocomposites"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2011 So Youn Kim"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/29440"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The states of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with varying (i) polymer concentration, (ii) solvent type, (iii) temperature, (iv) particle volume fraction and (v) polymer chemistry while polymer-to-solvent volume ratio is held between 0.45 and 1. The local order and long wave length concentration fluctuations of nanoparticles are obtained from the analysis of scattering structure factors and compared with the Polymer Reference Site Interaction Model (PRISM) theory. Exploiting contrast matching small-angle neutron scattering all partial collective structure factors of particles, polymers and their interface are characterized establishing the existence and size of adsorbed polymer layers. Comparisons of experimental structure factors to PRISM predictions yield a key parameter, the polymer segment-nanoparticle attractive contact interaction energy. This cohesive energy controls the state of particle and polymer dispersions. The thermodynamic information obtained in these experiments is linked to the polymer dynamics using free induction decay of NMR experiments, which directly quantify the amount of polymer adsorption while multi-quantum NMR experiments probe the existence of physical crosslinks and entanglements. Taken together this thesis provides detailed information of nanoparticle dispersions in dense polymer solutions and polymer nanocomposites and insight into how to manipulate particles and polymer to control particle aggregation.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-11-16T20:33:51Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 4 Kim_So Youn.pdf: 3761199 bytes, checksum: bacc52357433b57b5669aecddca92e80 (MD5) Kim_So Youn.pdf: 3756600 bytes, checksum: 166d79e0634b1ccf1907dd348d31c72b (MD5) Kim_dissertation.docx: 12740080 bytes, checksum: 2769873c05a1cb650f864b946723082e (MD5) Kim_So Youn.pdf: 3761199 bytes, checksum: bacc52357433b57b5669aecddca92e80 (MD5)","Made available in DSpace on 2012-02-01T00:46:32Z (GMT). No. of bitstreams: 2 Kim_SoYoun.pdf: 3762713 bytes, checksum: 4deeed027eb905c442284ca940c6a0bd (MD5) license.txt: 4055 bytes, checksum: 2423a5096e172c36192bfadc30131eab (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:23Z Item is restricted until 2014-02-01T00:50:07Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:26Z Item was in collections: Dissertations and Theses - Chemical and Biomolecular Engineering (ID: 591) Graduate Theses and Dissertations at Illinois (ID: 204) No. of bitstreams: 3 Kim_SoYoun.pdf: 3762713 bytes, checksum: 4deeed027eb905c442284ca940c6a0bd (MD5) license.txt: 4055 bytes, checksum: 2423a5096e172c36192bfadc30131eab (MD5) Kim_SoYoun.pdf.txt: 349573 bytes, checksum: de7b757bb09f0ba85ed20a019a72a043 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:26Z"]},{"key":"dc:title","label":"Title","values":["Particle microstructure and polymer dynamics in concentrated polymer solutions"]}]}],"canonical_facts":{"dc:contributor":["Zukoski, Charles F.","Schroeder, Charles M.","Kenis, Paul J.A.","Schweizer, Kenneth S."],"dc:creator":["Kim, So Youn"],"dc:date":["2012-02-01T00:46:32Z","2014-02-01T11:00:26Z","2011-12"],"dc:description":["The states of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with varying (i) polymer concentration, (ii) solvent type, (iii) temperature, (iv) particle volume fraction and (v) polymer chemistry while polymer-to-solvent volume ratio is held between 0.45 and 1. The local order and long wave length concentration fluctuations of nanoparticles are obtained from the analysis of scattering structure factors and compared with the Polymer Reference Site Interaction Model (PRISM) theory. Exploiting contrast matching small-angle neutron scattering all partial collective structure factors of particles, polymers and their interface are characterized establishing the existence and size of adsorbed polymer layers. Comparisons of experimental structure factors to PRISM predictions yield a key parameter, the polymer segment-nanoparticle attractive contact interaction energy. This cohesive energy controls the state of particle and polymer dispersions. The thermodynamic information obtained in these experiments is linked to the polymer dynamics using free induction decay of NMR experiments, which directly quantify the amount of polymer adsorption while multi-quantum NMR experiments probe the existence of physical crosslinks and entanglements. Taken together this thesis provides detailed information of nanoparticle dispersions in dense polymer solutions and polymer nanocomposites and insight into how to manipulate particles and polymer to control particle aggregation.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-11-16T20:33:51Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 4 Kim_So Youn.pdf: 3761199 bytes, checksum: bacc52357433b57b5669aecddca92e80 (MD5) Kim_So Youn.pdf: 3756600 bytes, checksum: 166d79e0634b1ccf1907dd348d31c72b (MD5) Kim_dissertation.docx: 12740080 bytes, checksum: 2769873c05a1cb650f864b946723082e (MD5) Kim_So Youn.pdf: 3761199 bytes, checksum: bacc52357433b57b5669aecddca92e80 (MD5)","Made available in DSpace on 2012-02-01T00:46:32Z (GMT). No. of bitstreams: 2 Kim_SoYoun.pdf: 3762713 bytes, checksum: 4deeed027eb905c442284ca940c6a0bd (MD5) license.txt: 4055 bytes, checksum: 2423a5096e172c36192bfadc30131eab (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:23Z Item is restricted until 2014-02-01T00:50:07Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:26Z Item was in collections: Dissertations and Theses - Chemical and Biomolecular Engineering (ID: 591) Graduate Theses and Dissertations at Illinois (ID: 204) No. of bitstreams: 3 Kim_SoYoun.pdf: 3762713 bytes, checksum: 4deeed027eb905c442284ca940c6a0bd (MD5) license.txt: 4055 bytes, checksum: 2423a5096e172c36192bfadc30131eab (MD5) Kim_SoYoun.pdf.txt: 349573 bytes, checksum: de7b757bb09f0ba85ed20a019a72a043 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:26Z"],"dc:identifier":["http://hdl.handle.net/2142/29440"],"dc:language":["en"],"dc:rights":["Copyright 2011 So Youn Kim"],"dc:subject":["nanoparticle dispersion","particle microstructure","polymer solution","nanocomposites"],"dc:title":["Particle microstructure and polymer dynamics in concentrated polymer solutions"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:27Z"}