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Dynamics and Large Strain Behavior of Self-Healing Hydrogels with and without Surfactants

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dc.contributor.authorTuncaboylu, Deniz C.
dc.contributor.authorSahin, Melahat
dc.contributor.authorArgun, Aslihan
dc.contributor.authorOppermann, Wilhelm
dc.contributor.authorOkay, Oğuz
dc.contributor.institutionauthorTUNCABOYLU, DENIZ CEYLAN
dc.date.accessioned2020-10-29T21:35:16Z
dc.date.available2020-10-29T21:35:16Z
dc.date.issued2012-02-28T00:00:00Z
dc.description.abstractPolyacrylamide hydrogels formed via hydrophobic interactions between stearyl groups in aqueous micellar solution of sodium dodecyl sulfate (SDS) present two faces depending on which state they are. The gels containing SDS micelles exhibit, in addition to the fast mode, a slow relaxation mode in dynamic light scattering (DLS) and time-dependent elastic moduli, indicating the temporary nature of the hydrophobic associations having lifetimes of the order of seconds to milliseconds. The gels where SDS had been removed after their preparation behave similar to chemically cross-linked ones with time-independent elastic moduli, a high degree of spatial inhomogeneity, and a single relaxation mode in DLS. Because of this drastic structural change, the physical gels are insoluble in water with a gel fraction close to unity. In surfactant containing gels, a large proportion of physical cross-links dissociate under force, but they do so reversibly, if the force is removed they reform again. The reversible disengagements of the hydrophobic units building the physical cross-links leads to a self-healing efficiency of nearly 100%, while no such healing behavior was observed after extraction of SDS due to the loss of the reversible nature of the cross-linkages.
dc.identifier.citationTuncaboylu D. C. , Sahin M., Argun A., Oppermann W., Okay O., -Dynamics and Large Strain Behavior of Self-Healing Hydrogels with and without Surfactants-, MACROMOLECULES, cilt.45, ss.1991-2000, 2012
dc.identifier.doi10.1021/ma202672y
dc.identifier.scopus84857554716
dc.identifier.urihttp://hdl.handle.net/20.500.12645/26335
dc.identifier.wosWOS:000300757000029
dc.titleDynamics and Large Strain Behavior of Self-Healing Hydrogels with and without Surfactants
dc.typeArticle
dspace.entity.typePublication
local.avesis.id919a3842-50f0-4030-8f54-071bcc9db468
local.publication.isinternational1
relation.isAuthorOfPublicationac53edd0-862b-4855-8c83-91c45c3cfd61
relation.isAuthorOfPublication.latestForDiscoveryac53edd0-862b-4855-8c83-91c45c3cfd61
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