{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101693"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101693","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Specific ion effects on transient polymers: a new strategy for programmable microcapusles","abstract":"Transient polymers are emerging materials that transform from macromolecules to small molecules triggered by predefined environmental stimuli. Distinct from traditional degradable polymers, transient materials undergo domino like chain unzipping reactions, leading to controlled and complete depolymerization upon one cleavage. Taking advantage of the unique feature of triggered materials transience, this dissertation focuses on developing transient polymer microcapsules for programmable payload release. In Chapter 2, a rapid solvent evaporation strategy was developed to prepare transient polymer microcapsules with a low-ceiling-temperature polymer, cyclic poly(phthalaldehyde) (cPPA), as the shell wall materials. Chapter 3 described an ion co-activation effect that modulated cPPA depolymerization rates in the presence of acid. In Chapter 4, we further investigated the ion specificity in the co-activation effect and anion solvation properties were found to significantly impact the co-activation behavior. Based on the specific ion co-activation effect, we developed programmable microcapsules whose payload release kinetics depends on the ionic species in the solutions. Chapter 5 further expanded the co-activation effect in Lewis acid solutions that achieved depolymerization in mild environment. In Chapter 6, several studies were devoted to understand the molecular and interfacial mechanisms of the ion co-activation effect. Chapter 7 reviewed current topics on the Hofmeister effect and constructed a crude model on auto-catalytic microcapsules. The thesis research offers an encapsulation strategy and ion library for triggered release microcapsules and will be of significance for designing logic gate responsive microcapsules, reversible activation-deactivation materials and self-regulating reaction networks in autonomous chemical system.","abstract_html":"Transient polymers are emerging materials that transform from macromolecules to small molecules triggered by predefined environmental stimuli. Distinct from traditional degradable polymers, transient materials undergo domino like chain unzipping reactions, leading to controlled and complete depolymerization upon one cleavage. Taking advantage of the unique feature of triggered materials transience, this dissertation focuses on developing transient polymer microcapsules for programmable payload release. In Chapter 2, a rapid solvent evaporation strategy was developed to prepare transient polymer microcapsules with a low-ceiling-temperature polymer, cyclic poly(phthalaldehyde) (cPPA), as the shell wall materials. Chapter 3 described an ion co-activation effect that modulated cPPA depolymerization rates in the presence of acid. In Chapter 4, we further investigated the ion specificity in the co-activation effect and anion solvation properties were found to significantly impact the co-activation behavior. Based on the specific ion co-activation effect, we developed programmable microcapsules whose payload release kinetics depends on the ionic species in the solutions. Chapter 5 further expanded the co-activation effect in Lewis acid solutions that achieved depolymerization in mild environment. In Chapter 6, several studies were devoted to understand the molecular and interfacial mechanisms of the ion co-activation effect. Chapter 7 reviewed current topics on the Hofmeister effect and constructed a crude model on auto-catalytic microcapsules. The thesis research offers an encapsulation strategy and ion library for triggered release microcapsules and will be of significance for designing logic gate responsive microcapsules, reversible activation-deactivation materials and self-regulating reaction networks in autonomous chemical system.","abstract_has_math":false,"creators":["Tang, Shijia"],"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":["Moore, Jeffrey S.","Braun, Paul V.","Chen, Qian","Evans, Christopher M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:30:28Z","date_published":"2018-09-27T16:30:28Z","updated_at":"2026-07-22T22:24:40Z","subjects":["Transient polymers, Triggered release, Hofmeister effect, Depolymerization kinetics"],"languages":["en"],"rights":["Copyright 2018 Shijia Tang"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101693","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.","Chen, Qian","Evans, Christopher M."]},{"key":"dc:creator","label":"Author","values":["Tang, Shijia"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:30:28Z","2020-09-28T09:15:24Z","2018-07-13","2018-08"]},{"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":["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":["Transient polymers, Triggered release, Hofmeister effect, Depolymerization kinetics"]}]},{"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 Shijia Tang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101693"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Transient polymers are emerging materials that transform from macromolecules to small molecules triggered by predefined environmental stimuli. Distinct from traditional degradable polymers, transient materials undergo domino like chain unzipping reactions, leading to controlled and complete depolymerization upon one cleavage. Taking advantage of the unique feature of triggered materials transience, this dissertation focuses on developing transient polymer microcapsules for programmable payload release. In Chapter 2, a rapid solvent evaporation strategy was developed to prepare transient polymer microcapsules with a low-ceiling-temperature polymer, cyclic poly(phthalaldehyde) (cPPA), as the shell wall materials. Chapter 3 described an ion co-activation effect that modulated cPPA depolymerization rates in the presence of acid. In Chapter 4, we further investigated the ion specificity in the co-activation effect and anion solvation properties were found to significantly impact the co-activation behavior. Based on the specific ion co-activation effect, we developed programmable microcapsules whose payload release kinetics depends on the ionic species in the solutions. Chapter 5 further expanded the co-activation effect in Lewis acid solutions that achieved depolymerization in mild environment. In Chapter 6, several studies were devoted to understand the molecular and interfacial mechanisms of the ion co-activation effect. Chapter 7 reviewed current topics on the Hofmeister effect and constructed a crude model on auto-catalytic microcapsules. The thesis research offers an encapsulation strategy and ion library for triggered release microcapsules and will be of significance for designing logic gate responsive microcapsules, reversible activation-deactivation materials and self-regulating reaction networks in autonomous chemical system.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-08-01","The student, Shijia Tang, accepted the attached license on 2018-07-10 at 00:04.","The student, Shijia Tang, submitted this Dissertation for approval on 2018-07-11 at 09:22.","This Dissertation was approved for publication on 2018-07-13 at 09:41.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12789 on 2018-09-27 at 11:18:40","Made available in DSpace on 2018-09-27T16:30:28Z (GMT). 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Distinct from traditional degradable polymers, transient materials undergo domino like chain unzipping reactions, leading to controlled and complete depolymerization upon one cleavage. Taking advantage of the unique feature of triggered materials transience, this dissertation focuses on developing transient polymer microcapsules for programmable payload release. In Chapter 2, a rapid solvent evaporation strategy was developed to prepare transient polymer microcapsules with a low-ceiling-temperature polymer, cyclic poly(phthalaldehyde) (cPPA), as the shell wall materials. Chapter 3 described an ion co-activation effect that modulated cPPA depolymerization rates in the presence of acid. In Chapter 4, we further investigated the ion specificity in the co-activation effect and anion solvation properties were found to significantly impact the co-activation behavior. Based on the specific ion co-activation effect, we developed programmable microcapsules whose payload release kinetics depends on the ionic species in the solutions. Chapter 5 further expanded the co-activation effect in Lewis acid solutions that achieved depolymerization in mild environment. In Chapter 6, several studies were devoted to understand the molecular and interfacial mechanisms of the ion co-activation effect. Chapter 7 reviewed current topics on the Hofmeister effect and constructed a crude model on auto-catalytic microcapsules. The thesis research offers an encapsulation strategy and ion library for triggered release microcapsules and will be of significance for designing logic gate responsive microcapsules, reversible activation-deactivation materials and self-regulating reaction networks in autonomous chemical system.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-08-01","The student, Shijia Tang, accepted the attached license on 2018-07-10 at 00:04.","The student, Shijia Tang, submitted this Dissertation for approval on 2018-07-11 at 09:22.","This Dissertation was approved for publication on 2018-07-13 at 09:41.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12789 on 2018-09-27 at 11:18:40","Made available in DSpace on 2018-09-27T16:30:28Z (GMT). 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