Dewetting of thin polymer films

• Verfasst von: Ziebert, Falko [VerfasserIn]
• Verfasst von: Raphaël, Elie [VerfasserIn]
• Titel: Dewetting of thin polymer films
• Titelzusatz: influence of interface evolution
• Verf.angabe: F. Ziebert and E. Raphaël
• E-Jahr: 2009
• Jahr: 20 May 2009
• Umfang: 6 S.
• Fussnoten: Gesehen am 23.09.2022
• Titel Quelle: Enthalten in: epl
• Ort Quelle: Les Ulis : EDP Sciences, 1986
• Jahr Quelle: 2009
• Band/Heft Quelle: 86(2009), 4, Artikel-ID 46001, Seite 1-6
• ISSN Quelle: 1286-4854
• DOI: doi:10.1209/0295-5075/86/46001
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1807850927

Abstract

The dewetting dynamics of ultrathin polymer films, e.g., in the model system of polystyrene on a polydimethylsiloxane-covered substrate, exhibits interesting behavior like a fast decay of the dewetting velocity and a maximum in the width of the built-up rim in the course of time. These features have been recently ascribed to the relaxation of residual stresses in the film that stem from the nonequilibrium preparation of the samples. Recent experiments by Coppée et al. on PS with low molecular weight, where such stresses could not be evidenced, showed however similar behavior. By scaling arguments and numerical solution of a thin-film viscoelastic model we show that the maximum in the width of the rim can be caused by a temporal evolution of the friction coefficient (or equivalently of the slip length), for which we discuss two possible mechanisms. In addition, the maximum in the width is affected by the sample age. As a consequence, knowing the temporal behavior of friction (or slip length) in principle allows to measure the aging dynamics of a polymer-polymer interface by simple dewetting experiments.