LMP Seminar: Dynamics of thin polymer films

LMP Seminar

  • Datum: 03.03.2020
  • Uhrzeit: 14:00 - 15:30
  • Vortragende(r): Dr. Elie Raphael
  • CNRS, Laboratory Gulliver, ESPCI Paris, France
  • Ort: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Raum: SR 0.79, Am Faßberg 17, Göttingen
  • Gastgeber: MPIDS / LMP
  • Kontakt: golestanian-office@ds.mpg.de
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 Tg. Above Tg, the entire film flows, whereas below Tg 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-Tg data. The system transitions from whole-film flow to surface localized flow over a narrow temperature region near the bulk Tg. The experiments and model provide a measure of surface mobility in a simple geometry. This fine control of the glassy rheology is of key interest to nano lithography among numerous other applications.
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