Measurement of the depth-dependent local dynamics in thin polymer films through rejuvenation of ultrastable glasses
Language
en
Document de travail - Pré-publication
English Abstract
We 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 ...Read more >
We 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.Read less <
European Project
Brownian Motion near Soft Interfaces
ANR Project
Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Frottements dans les systèmes complexes - ANR-21-CE06-0039
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Frottements dans les systèmes complexes - ANR-21-CE06-0039
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Origin
Hal imported