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- W4311000309 abstract "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." @default.
- W4311000309 created "2022-12-22" @default.
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- W4311000309 date "2022-12-08" @default.
- W4311000309 modified "2023-10-17" @default.
- W4311000309 title "On the bridge hypothesis in the glass transition of freestanding polymer films" @default.
- W4311000309 doi "https://doi.org/10.48550/arxiv.2212.04296" @default.
- W4311000309 hasPublicationYear "2022" @default.
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