{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/78426"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/78426","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Multi-stage polymer systems for the autonomic regeneration of large damage volumes","abstract":"Recovery of catastrophic damage requires a robust chemistry capable of addressing the complex challenges encountered by autonomic regeneration. Although self-healing polymers have the potential to increase material lifetimes and safety, these systems have been limited to recovery of internal microcracks and surface damage. Current technologies thereby fail to address the restoration of large, open damage volumes. A regenerative chemistry was developed by incorporating a gel scaffold within liquid healing agents. The healing system undergoes two stages, sol-gel and gel-polymer. Stage 1, rapid formation of a crosslinked gel, creates a synthetic support for the healing agents as they deposit across the damage region. Stage 2 comprises the polymerization of monomer using a room temperature redox initiation system to recover the mechanical properties of the substrate. The two stages are chemically compatible and only react when a specific reaction trigger is introduced – an acid catalyst for gelation and initiator-promoter for polymerization. Cure kinetics, chemical and mechanical properties can be tuned by employing different monomer systems. The versatile gelation chemistry gels over 20 vinyl monomers to yield both thermoplastic and thermosetting polymers. The healing efficacy of the two-stage system was studied in thin, vascularized epoxy sheets. By splitting the chemistry into two low viscosity fluids, we demonstrated regeneration of gaps up to 9 mm in diameter. The combination of microvascular networks and a new healing chemistry demonstrates an innovative healing system that significantly exceeds the performance of traditional methods.","abstract_html":"Recovery of catastrophic damage requires a robust chemistry capable of addressing the complex challenges encountered by autonomic regeneration. Although self-healing polymers have the potential to increase material lifetimes and safety, these systems have been limited to recovery of internal microcracks and surface damage. Current technologies thereby fail to address the restoration of large, open damage volumes. A regenerative chemistry was developed by incorporating a gel scaffold within liquid healing agents. The healing system undergoes two stages, sol-gel and gel-polymer. Stage 1, rapid formation of a crosslinked gel, creates a synthetic support for the healing agents as they deposit across the damage region. Stage 2 comprises the polymerization of monomer using a room temperature redox initiation system to recover the mechanical properties of the substrate. The two stages are chemically compatible and only react when a specific reaction trigger is introduced – an acid catalyst for gelation and initiator-promoter for polymerization. Cure kinetics, chemical and mechanical properties can be tuned by employing different monomer systems. The versatile gelation chemistry gels over 20 vinyl monomers to yield both thermoplastic and thermosetting polymers. The healing efficacy of the two-stage system was studied in thin, vascularized epoxy sheets. By splitting the chemistry into two low viscosity fluids, we demonstrated regeneration of gaps up to 9 mm in diameter. The combination of microvascular networks and a new healing chemistry demonstrates an innovative healing system that significantly exceeds the performance of traditional methods.","abstract_has_math":false,"creators":["Santa Cruz, Windy Ann"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["Moore, Jeffrey S.","Braun, Paul V.","Kilian, Kristopher A.","Murphy, Catherine J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-22T22:17:09Z","date_published":"2015-07-22T22:17:09Z","updated_at":"2026-07-22T22:26:11Z","subjects":["self-healing","large damage volumes","two-stage polymers"],"languages":["en"],"rights":["Copyright 2015 Windy Ann Santa Cruz"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/78426","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Moore, Jeffrey S.","Braun, Paul V.","Kilian, Kristopher A.","Murphy, Catherine J."]},{"key":"dc:creator","label":"Author","values":["Santa Cruz, Windy Ann"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-07-22T22:17:09Z","2015-05","2015-04-23","2015-5"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"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":["self-healing","large damage volumes","two-stage polymers"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Windy Ann Santa Cruz"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/78426"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Recovery of catastrophic damage requires a robust chemistry capable of addressing the complex challenges encountered by autonomic regeneration. Although self-healing polymers have the potential to increase material lifetimes and safety, these systems have been limited to recovery of internal microcracks and surface damage. Current technologies thereby fail to address the restoration of large, open damage volumes. A regenerative chemistry was developed by incorporating a gel scaffold within liquid healing agents. The healing system undergoes two stages, sol-gel and gel-polymer. Stage 1, rapid formation of a crosslinked gel, creates a synthetic support for the healing agents as they deposit across the damage region. Stage 2 comprises the polymerization of monomer using a room temperature redox initiation system to recover the mechanical properties of the substrate. The two stages are chemically compatible and only react when a specific reaction trigger is introduced – an acid catalyst for gelation and initiator-promoter for polymerization. Cure kinetics, chemical and mechanical properties can be tuned by employing different monomer systems. The versatile gelation chemistry gels over 20 vinyl monomers to yield both thermoplastic and thermosetting polymers. The healing efficacy of the two-stage system was studied in thin, vascularized epoxy sheets. By splitting the chemistry into two low viscosity fluids, we demonstrated regeneration of gaps up to 9 mm in diameter. The combination of microvascular networks and a new healing chemistry demonstrates an innovative healing system that significantly exceeds the performance of traditional methods.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Windy Santa Cruz, accepted the attached license on 2015-04-20 at 13:09.","The student, Windy Santa Cruz, submitted this Dissertation for approval on 2015-04-20 at 13:17.","This Dissertation was approved for publication on 2015-04-23 at 08:25.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7950 on 2015-07-22 at 10:32:54","Made available in DSpace on 2015-07-22T22:17:09Z (GMT). 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Although self-healing polymers have the potential to increase material lifetimes and safety, these systems have been limited to recovery of internal microcracks and surface damage. Current technologies thereby fail to address the restoration of large, open damage volumes. A regenerative chemistry was developed by incorporating a gel scaffold within liquid healing agents. The healing system undergoes two stages, sol-gel and gel-polymer. Stage 1, rapid formation of a crosslinked gel, creates a synthetic support for the healing agents as they deposit across the damage region. Stage 2 comprises the polymerization of monomer using a room temperature redox initiation system to recover the mechanical properties of the substrate. The two stages are chemically compatible and only react when a specific reaction trigger is introduced – an acid catalyst for gelation and initiator-promoter for polymerization. Cure kinetics, chemical and mechanical properties can be tuned by employing different monomer systems. The versatile gelation chemistry gels over 20 vinyl monomers to yield both thermoplastic and thermosetting polymers. The healing efficacy of the two-stage system was studied in thin, vascularized epoxy sheets. By splitting the chemistry into two low viscosity fluids, we demonstrated regeneration of gaps up to 9 mm in diameter. The combination of microvascular networks and a new healing chemistry demonstrates an innovative healing system that significantly exceeds the performance of traditional methods.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Windy Santa Cruz, accepted the attached license on 2015-04-20 at 13:09.","The student, Windy Santa Cruz, submitted this Dissertation for approval on 2015-04-20 at 13:17.","This Dissertation was approved for publication on 2015-04-23 at 08:25.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7950 on 2015-07-22 at 10:32:54","Made available in DSpace on 2015-07-22T22:17:09Z (GMT). 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