BONNEAU, Haggai; ARUTKIN, Maxence; CHEN, Rainni; FORREST, James; RAPHAËL, Elie; SALEZ, Thomas

doi:10.1140/epje/s10189-023-00272-z

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BONNEAU, Haggai
Gulliver (UMR 7083)

ARUTKIN, Maxence
Tel Aviv University [TAU]

CHEN, Rainni
University of Toronto, Toronto

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Article de revue

Ce document a été publié dans

European Physical Journal E: Soft matter and biological physics. 2023, vol. 46, n° 3, p. 8

EDP Sciences: EPJ

Résumé en anglais

Freestanding thin polymer films with high molecular weights exhibit an anomalous decrease in the glass-transition temperature with film thickness. Specifically, in such materials, the measured glass-transition temperature evolves in an affine way with the film thickness, with a slope that weakly depends on the molecular weight. De Gennes proposed a sliding mechanism as the hypothetical dominant relaxation process in these systems, where stress kinks could propagate in a reptation-like fashion through so called bridges, i.e. from one free interface to the other along the backbones of polymer macromolecules. Here, by considering the exact statistics of finite-sized random walks within a confined box, we investigate in details the bridge hypothesis. We show that the sliding mechanism cannot reproduce the basic features appearing in the experiments, and we exhibit the fundamental reasons behind such a fact.< Réduire

DOI

http://dx.doi.org/10.1140/epje/s10189-023-00272-z

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029
Frottements dans les systèmes complexes - ANR-21-CE06-0039

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798