{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115464"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115464","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Viscoelasticity of vitrimers: tunability and applications of dynamic 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":["Porath, Laura Elizabeth Gowlovech"],"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","Sottos, Nancy","Ewoldt, Randy H","Statt, Antonia"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:54Z","subjects":["vitrimers","dynamic polymer networks","rheology","viscoelasticity","vibration damping","ultra thin coating","self-healing"],"languages":["en","eng"],"rights":["Copyright 2022, Laura Porath"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115464","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Evans, Christopher M","Sottos, Nancy","Ewoldt, Randy H","Statt, Antonia"]},{"key":"dc:creator","label":"Author","values":["Porath, Laura Elizabeth Gowlovech"]}]},{"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":["vitrimers","dynamic polymer networks","rheology","viscoelasticity","vibration damping","ultra thin coating","self-healing"]}]},{"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, Laura Porath"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115464"]}]},{"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, Laura Porath, accepted the attached license on 2022-04-15 at 10:40.","The student, Laura Porath, submitted this Dissertation for approval on 2022-04-15 at 10:48.","This Dissertation was approved for publication on 2022-04-21 at 13:07.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17701 on 2022-11-11 at 13:15:19","Vitrimers are a type of self-healing polymer that have dynamic covalent associative bonds. Associative bonds, unlike dissociative bonds, do not break the network integrity during the exchange process, and therefore have no loss in network properties. Due to their dynamic nature, vitrimers experience viscoelasticity, or the ability to have both liquid (viscous) and solid (elastic) properties on different timescales. The rheology, which is the measure of how things flow, for these dynamic polymers is profoundly different from permanent polymers and melts. Vitrimers experience Arrhenius behavior of relaxation time or viscosity versus temperature, whereas typical polymers exhibit a steep increase in viscosity upon approaching the glass transition temperature. Due to their ability to self-heal and remain processable over a much wider temperature range, vitrimers are ideal for many applications including 3D printing, adhesives, battery electrolytes, energy dissipation, drug delivery carriers, and coatings. This work focuses on vitrimers of polydimethylsiloxane backbone crosslinked with various boronic esters. First, the rheological techniques for these materials are discussed with both oscillatory shear and step stress experiments providing similar relaxation times in vitrimers of sufficiently high molecular weight. Then, crosslinkers with different kinetics are studied independently and mixed in the PDMS vitrimers in an effort to design multi-modal relaxation spectra for vibration damping. The mixed networks follow the viscoelastic properties of their faster component and do not show multiple peaks. Due to the hydrophobic and dynamic behavior PDMS vitrimers, these materials were made into ultra-thin vitrimer coatings, which were able to self-heal abrasions and withstand condensation for weeks. Investigating the viscoelastic properties of the PDMS vitrimers while systematically tuning their chemistry has led to better understanding of dynamic materials and the design of successful materials for applications."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Viscoelasticity of vitrimers: tunability and applications of dynamic networks"]}]}],"canonical_facts":{"dc:contributor":["Evans, Christopher M","Sottos, Nancy","Ewoldt, Randy H","Statt, Antonia"],"dc:creator":["Porath, Laura Elizabeth Gowlovech"],"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, Laura Porath, accepted the attached license on 2022-04-15 at 10:40.","The student, Laura Porath, submitted this Dissertation for approval on 2022-04-15 at 10:48.","This Dissertation was approved for publication on 2022-04-21 at 13:07.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17701 on 2022-11-11 at 13:15:19","Vitrimers are a type of self-healing polymer that have dynamic covalent associative bonds. Associative bonds, unlike dissociative bonds, do not break the network integrity during the exchange process, and therefore have no loss in network properties. Due to their dynamic nature, vitrimers experience viscoelasticity, or the ability to have both liquid (viscous) and solid (elastic) properties on different timescales. The rheology, which is the measure of how things flow, for these dynamic polymers is profoundly different from permanent polymers and melts. Vitrimers experience Arrhenius behavior of relaxation time or viscosity versus temperature, whereas typical polymers exhibit a steep increase in viscosity upon approaching the glass transition temperature. Due to their ability to self-heal and remain processable over a much wider temperature range, vitrimers are ideal for many applications including 3D printing, adhesives, battery electrolytes, energy dissipation, drug delivery carriers, and coatings. This work focuses on vitrimers of polydimethylsiloxane backbone crosslinked with various boronic esters. First, the rheological techniques for these materials are discussed with both oscillatory shear and step stress experiments providing similar relaxation times in vitrimers of sufficiently high molecular weight. Then, crosslinkers with different kinetics are studied independently and mixed in the PDMS vitrimers in an effort to design multi-modal relaxation spectra for vibration damping. The mixed networks follow the viscoelastic properties of their faster component and do not show multiple peaks. Due to the hydrophobic and dynamic behavior PDMS vitrimers, these materials were made into ultra-thin vitrimer coatings, which were able to self-heal abrasions and withstand condensation for weeks. Investigating the viscoelastic properties of the PDMS vitrimers while systematically tuning their chemistry has led to better understanding of dynamic materials and the design of successful materials for applications."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115464"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022, Laura Porath"],"dc:subject":["vitrimers","dynamic polymer networks","rheology","viscoelasticity","vibration damping","ultra thin coating","self-healing"],"dc:title":["Viscoelasticity of vitrimers: tunability and applications of dynamic 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"}