{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88307"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88307","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Autonomous indication of damage in epoxy coatings","abstract":"DSpace SAF Submission Ingestion Package generated from Vireo submission #8579 on 2015-09-29 at 15:06:42","abstract_html":"DSpace SAF Submission Ingestion Package generated from Vireo submission #8579 on 2015-09-29 at 15:06:42","abstract_has_math":false,"creators":["Matthews, Christopher Coleman"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Sottos, Nancy R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-29T21:08:21Z","date_published":"2015-09-29T21:08:21Z","updated_at":"2026-07-22T22:26:32Z","subjects":["damage indication","microcapsules","smart coating","fluorescence","fluorescamine"],"languages":["en"],"rights":["Copyright 2015 Christopher Matthews"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/88307","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sottos, Nancy R."]},{"key":"dc:creator","label":"Author","values":["Matthews, Christopher Coleman"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-29T21:08:21Z","2017-09-30T09:15:38Z","2015-08","2015-07-21","2015-8"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"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":["damage indication","microcapsules","smart coating","fluorescence","fluorescamine"]}]},{"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 Christopher Matthews"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/88307"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["DSpace SAF Submission Ingestion Package generated from Vireo submission #8579 on 2015-09-29 at 15:06:42","Industrial coatings are applied for their aesthetic appeal and ability to protect the underlying substrate material from the environment. The indication of coating flaws for correction becomes more important for coatings operating in extreme environments. Visual indication coating damage can aid in quickly locating and repairing damage before the underlying substrate degrades or fails. In this work, fluorescent damage indication was achieved with a dual capsule system embedded in an epoxy coating. Fluorescamine, a turn-on fluorescent indicator chosen for selectivity towards primary amines, and an amine based epoxy curing agent were separately encapsulated and incorporated into an epoxy coating. When mechanical damage ruptures both capsules, fluorescamine instantly reacts with primary amines to develop a bright blue fluorescence. This dual capsule system holds the promise of creating a smart coating with damage sensing and autonomous self-healing. Clear epoxy coatings with various concentrations of indicator and amine capsules were deposited onto glass slides and scratched with a razor blade. A coating containing an even distribution of 5 wt% indicator capsules and 5 wt% amine capsules achieved the most consistent indication performance. Using the same capsule concentration, an epoxy coating with carbon black as a pigment was used to dye the epoxy matrix. Damage indication in the pigmented coating performed similarly to the clear epoxy coating. Another coating consisted of two distinct layers, where clear epoxy with embedded microcapsules was covered with an acrylic spray paint. When scratched, fluorescent indication response was considerably muted when compared to a clear epoxy coating. Indication of low velocity impact damage to glass fiber composite coupons was also achieved with this system. Fluorescence was present where the impact tup contacted the smart coating on the specimen top surface. The back surface suffered micro-cracks and delamination but did not fluoresce due to poor mixing of indicator and amine in the damage region.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-08-01","The student, Christopher Matthews, accepted the attached license on 2015-07-20 at 22:00.","The student, Christopher Matthews, submitted this Thesis for approval on 2015-07-20 at 22:08.","This Thesis was approved for publication on 2015-07-21 at 13:17.","Made available in DSpace on 2015-09-29T21:08:21Z (GMT). No. of bitstreams: 2 MATTHEWS-THESIS-2015.pdf: 59906713 bytes, checksum: 7c6ae312f42541a125a52374e58e9038 (MD5) LICENSE.txt: 4217 bytes, checksum: e6c6c2eb3f29545b6027be266362bfd7 (MD5) Previous issue date: 2015-07-21","Embargo set by: Seth Robbins for item 89588 Lift date: 2017-09-29T21:08:35Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 89588 on 2017-09-30T09:15:38Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Autonomous indication of damage in epoxy coatings"]}]}],"canonical_facts":{"dc:contributor":["Sottos, Nancy R."],"dc:creator":["Matthews, Christopher Coleman"],"dc:date":["2015-09-29T21:08:21Z","2017-09-30T09:15:38Z","2015-08","2015-07-21","2015-8"],"dc:description":["DSpace SAF Submission Ingestion Package generated from Vireo submission #8579 on 2015-09-29 at 15:06:42","Industrial coatings are applied for their aesthetic appeal and ability to protect the underlying substrate material from the environment. The indication of coating flaws for correction becomes more important for coatings operating in extreme environments. Visual indication coating damage can aid in quickly locating and repairing damage before the underlying substrate degrades or fails. In this work, fluorescent damage indication was achieved with a dual capsule system embedded in an epoxy coating. Fluorescamine, a turn-on fluorescent indicator chosen for selectivity towards primary amines, and an amine based epoxy curing agent were separately encapsulated and incorporated into an epoxy coating. When mechanical damage ruptures both capsules, fluorescamine instantly reacts with primary amines to develop a bright blue fluorescence. This dual capsule system holds the promise of creating a smart coating with damage sensing and autonomous self-healing. Clear epoxy coatings with various concentrations of indicator and amine capsules were deposited onto glass slides and scratched with a razor blade. A coating containing an even distribution of 5 wt% indicator capsules and 5 wt% amine capsules achieved the most consistent indication performance. Using the same capsule concentration, an epoxy coating with carbon black as a pigment was used to dye the epoxy matrix. Damage indication in the pigmented coating performed similarly to the clear epoxy coating. Another coating consisted of two distinct layers, where clear epoxy with embedded microcapsules was covered with an acrylic spray paint. When scratched, fluorescent indication response was considerably muted when compared to a clear epoxy coating. Indication of low velocity impact damage to glass fiber composite coupons was also achieved with this system. Fluorescence was present where the impact tup contacted the smart coating on the specimen top surface. The back surface suffered micro-cracks and delamination but did not fluoresce due to poor mixing of indicator and amine in the damage region.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-08-01","The student, Christopher Matthews, accepted the attached license on 2015-07-20 at 22:00.","The student, Christopher Matthews, submitted this Thesis for approval on 2015-07-20 at 22:08.","This Thesis was approved for publication on 2015-07-21 at 13:17.","Made available in DSpace on 2015-09-29T21:08:21Z (GMT). No. of bitstreams: 2 MATTHEWS-THESIS-2015.pdf: 59906713 bytes, checksum: 7c6ae312f42541a125a52374e58e9038 (MD5) LICENSE.txt: 4217 bytes, checksum: e6c6c2eb3f29545b6027be266362bfd7 (MD5) Previous issue date: 2015-07-21","Embargo set by: Seth Robbins for item 89588 Lift date: 2017-09-29T21:08:35Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 89588 on 2017-09-30T09:15:38Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/88307"],"dc:language":["en"],"dc:rights":["Copyright 2015 Christopher Matthews"],"dc:subject":["damage indication","microcapsules","smart coating","fluorescence","fluorescamine"],"dc:title":["Autonomous indication of damage in epoxy coatings"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:32Z"}