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Article Dans Une Revue Science Année : 2014

A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer

Y. Chai
Thomas Salez
J. D. Mcgraw
M. Benzaquen
K. Dalnoki-Veress
  • Fonction : Auteur
E. Raphael
  • Fonction : Auteur

Résumé

Thin polymer films have striking dynamical properties that differ from their bulk counterparts. With the simple geometry of a stepped polymer film on a substrate, we probe mobility above and below the glass transition temperature T-g. Above T-g the entire film flows, whereas below T-g only the near-surface region responds to the excess interfacial energy. An analytical thin-film model for flow limited to the free surface region shows excellent agreement with sub-T-g data. The system transitions from whole-film flow to surface localized flow over a narrow temperature region near the bulk T-g. The experiments and model provide a measure of surface mobility in a simple geometry where confinement and substrate effects are negligible. This fine control of the glassy rheology is of key interest to nanolithography among numerous other applications.

Dates et versions

hal-01577386 , version 1 (25-08-2017)

Identifiants

Citer

Y. Chai, Thomas Salez, J. D. Mcgraw, M. Benzaquen, K. Dalnoki-Veress, et al.. A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer. Science, 2014, 343 (6174), pp.994-999. ⟨10.1126/science.1244845⟩. ⟨hal-01577386⟩
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