Volume 90, Number 2, April 2010
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||20 May 2010|
Network swelling competing with translational entropy in autophobic polymer dewetting
Département de Physique, Faculté des Sciences, Université Libre de Bruxelles - Bd du Triomphe, CP 223, Belgium, EU
2 Physikalisches Institut, Universität Freiburg - Freiburg, Germany, EU
3 Université Claude Bernard Lyon 1, Ingénierie des Matriaux Polymères (IMP, UMR CNRS 5223) 69622 Villeurbanne Cedex, France, EU
4 Laboratoire Léon Brillouin, CEA Saclay - Gif-sur-Yvette Cedex, France, EU
Corresponding author: email@example.com
Accepted: 14 April 2010
Autophobic dewetting of a thin polystyrene (PS) layer on a cross-linked PS film has been studied with optical microscopy and neutron reflection. For two different cross-linking densities, the increase in contact angle and the fast decrease of both dewetting velocity and slippage length as a function of dewetting time indicate that the dewetting dynamics is controlled by the penetration of free linear polymer chains into the cross-linked film and the concomitant stretching of the network mesh: the loss of entropy of the network favors dewetting, while partial chain interdiffusion between the layers increases friction and eventually stabilizes the top film. In a second series of experiment, we modified the entropy of the network by swelling it with linear chains from a reservoir of identical polymers prior to depositing the top PS film. Once equilibrated, a stable interface without considerable interdiffusion between network and top film was achieved. Without such interdiffusion, a constant contact angle and a constant slippage length were observed.
PACS: 61.41.+e – Polymers, elastomers, and plastics / 61.05.fj – Neutron reflectometry / 68.35.Fx – Diffusion; interface formation
© EPLA, 2010
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