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Measurement of the depth-dependent local dynamics in thin polymer films through rejuvenation of ultrastable glasses

dc.contributor.authorKARIMI, Saba
dc.contributor.authorYIN, Junjie
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorSALEZ, Thomas
dc.contributor.authorFORREST, James
dc.date.accessioned2023-12-12T03:33:41Z
dc.date.available2023-12-12T03:33:41Z
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/186555
dc.description.abstractEnWe measure the isothermal rejuvenation of stable glass films of poly(styrene) and poly(methylmethacrylate). We demonstrate that the propagation of the front responsible for the transformation to a supercooled-liquid state can serve as a highly localized probe of the local supercooled dynamics. We use this connection to probe the depth-dependent relaxation rate with nanometric precision for a series of polystyrene films over a range of temperatures near the bulk glass transition temperature. The analysis shows the spatial extent of enhanced surface mobility and reveals the existence of an unexpected large dynamical length scale in the system. The results are compared with the cooperative-string model for glassy dynamics. The data reveals that the film-thickness dependence of whole film properties arises only from the volume fraction of the near-surface region. While the dynamics at the middle of the samples shows the expected bulk-like temperature dependence, the near-surface region shows very little dependence on temperature.
dc.description.sponsorshipMouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
dc.description.sponsorshipFrottements dans les systèmes complexes - ANR-21-CE06-0039
dc.description.sponsorshipCapteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
dc.language.isoen
dc.title.enMeasurement of the depth-dependent local dynamics in thin polymer films through rejuvenation of ultrastable glasses
dc.typeDocument de travail - Pré-publication
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Matière Molle [cond-mat.soft]
dc.identifier.arxiv2312.06210
dc.description.sponsorshipEuropeBrownian Motion near Soft Interfaces
bordeaux.hal.laboratoriesLaboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
hal.identifierhal-04328317
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04328317v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=KARIMI,%20Saba&YIN,%20Junjie&SALEZ,%20Thomas&FORREST,%20James&rft.genre=preprint


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