Modulus, confinement, and temperature effects on surface capillary wave dynamics in bilayer polymer films near the glass transition

Christopher M. Evans, Suresh Narayanan, Zhang Jiang, John M Torkelson*

*Corresponding author for this work

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

We report relaxation times (τ) for surface capillary waves on 27-127 nm polystyrene (PS) top layers in bilayer films using x-ray photon correlation spectroscopy. At ∼10°C above the PS glass transition temperature (T g), τ tracks with underlayer modulus, being significantly smaller on softer substrates at low in-plane scattering wave vector. Relative to capillary wave theory, we also report stiffening behavior upon nanoconfinement of the PS layers. At PS T g+40°C, both effects become negligible. We demonstrate how neighboring polymer domains impact dynamics over substantial length scales.

Original languageEnglish (US)
Article number038302
JournalPhysical Review Letters
Volume109
Issue number3
DOIs
StatePublished - Jul 17 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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