A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

145 Scopus Citations
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Author(s)

  • T. Salez
  • J. D. McGraw
  • M. Benzaquen
  • K. Dalnoki-Veress
  • E. Raphaël
  • J. A. Forrest

Detail(s)

Original languageEnglish
Pages (from-to)994-999
Journal / PublicationScience
Volume343
Issue number6174
Publication statusPublished - 28 Feb 2014
Externally publishedYes

Abstract

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 where confinement and substrate effects are negligible. This fine control of the glassy rheology is of key interest to nanolithography among numerous other applications.

Citation Format(s)

A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer. / Chai, Y.; Salez, T.; McGraw, J. D.; Benzaquen, M.; Dalnoki-Veress, K.; Raphaël, E.; Forrest, J. A.

In: Science, Vol. 343, No. 6174, 28.02.2014, p. 994-999.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal