Volume 72, Number 5, December 2005
|Page(s)||781 - 787|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||04 November 2005|
Dewetting of thin viscoelastic polymer films on slippery substrates
Laboratoire de Physique de la Matière Condensée, FRE 2844 du CNRS Collège de France - 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
Accepted: 6 October 2005
Dewetting of thin polystyrene films deposited onto silicon wafers exhibits unusual dynamics and rim morphologies. Here, we present a new theoretical approach of these phenomena taking into account both the viscoelastic properties of the film and the non-zero velocity of the film at the interface with the substrate (i.e. slippage). We show how these two ingredients lead to: a) a very asymmetric shape of the rim as the film dewets; b) a decrease of the dewetting velocity with time like for times shorter than the reptation time (for larger times, the dewetting velocity reaches a constant value). Recent experiments by Damman, Baudelet and Reiter (Phys. Rev. Lett., 91 (2003) 216101) present, however, a much faster decrease of the dewetting velocity. We then show how this striking result may be explained by the presence of residual stresses in the film.
PACS: 68.60.-p – Physical properties of thin films, nonelectronic / 68.15.+e – Liquid thin films / 68.55.-a – Thin film structure and morphology
© EDP Sciences, 2005
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