Self-Healing in the Presence of Monovalent and Divalent Ions

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dc.contributor.advisorGetachew, Bezawit A
dc.creatorParulski-Seager, Durnian Chen Chang Li
dc.date.accessioned2024-01-24T22:46:45Z
dc.date.available2024-01-24T22:46:45Z
dc.date.created2023-12
dc.date.issued2023-11-16
dc.date.submittedDecember 2023
dc.date.updated2024-01-24T22:46:45Z
dc.description.abstractSelf-healing materials are those that can recover from physical or chemical damage autonomously. To be applied in underwater applications such as water treatment, self-healing materials need to demonstrate sufficient healing ability in complex water matrices. Herein, we investigated how monovalent (NaCl) and divalent (MgSO4) ions at concentrations relevant to brackish and seawater salinity impact the self-healing efficiency of a model 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and N,N′-methylenebis(acrylamide) (MBA) hydrogel. It has been assumed that divalent ions would form ionic bonds and act as crosslinkers between viable functional groups (negatively charged oxygens, etc.). However, our results suggest that this assumption needs to be reconsidered. Under concentrations relevant to seawater (35 g/L), magnesium ions hindered self-healing efficiency by ∼30% as measured by recovery of ultimate tensile (UT) strength. On the other hand, they improved self-healing efficiency by ∼100% as measured by recovery of UT strain. A similar trend was also observed for sodium ions. The chemical crosslinker ratio when doubled did not impact self-healing efficiency. These results challenge the assumption that divalent ions always form ionic bonds that enhance healing and that chemical crosslinking alters the self-healing performance.
dc.format.mimetypeapplication/pdf
dc.identifier.citationParulski-Seager, Durnian Chen Chang Li. "Self-Healing in the Presence of Monovalent and Divalent Ions." (2023). Master's thesis, Rice University. https://hdl.handle.net/1911/115414
dc.identifier.urihttps://hdl.handle.net/1911/115414
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectsmart material
dc.subjectpolymer
dc.subjectself-healing
dc.subjecthydrogen bonding
dc.subjections
dc.titleSelf-Healing in the Presence of Monovalent and Divalent Ions
dc.typeThesis
dc.type.materialText
thesis.degree.departmentCivil and Environmental Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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