1. Network swelling competing with translational entropy in autophobic polymer dewetting
- Author
-
Béziel, W., Reiter, Gunter, Reiter, G., Drockenmuller, Eric, Ostaci, Roxana-Viorela, Al Akhrass, Samer, Cousin, F., Sferrazza, M., Département de Physique [Bruxelles] (ULB), Faculté des Sciences [Bruxelles] (ULB), Université libre de Bruxelles (ULB)-Université libre de Bruxelles (ULB), Institut de chimie des surfaces et interfaces de Mulhouse (ICSIM), Ecole Nationale Supérieure de Chimie de Mulhouse-Centre National de la Recherche Scientifique (CNRS), Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Ingénierie des Matériaux Polymères - Laboratoire des Matériaux Polymères et des Biomatériaux (IMP-LMPB), Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut de Chimie du CNRS (INC), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Institut de Chimie et des Surfaces et Interfaces (ICSI), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Linear polymer ,General Physics and Astronomy ,02 engineering and technology ,01 natural sciences ,law.invention ,Contact angle ,chemistry.chemical_compound ,Optics ,Optical microscope ,law ,0103 physical sciences ,medicine ,Dewetting ,Composite material ,010306 general physics ,chemistry.chemical_classification ,business.industry ,Polymer ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,[CHIM.POLY]Chemical Sciences/Polymers ,chemistry ,Polystyrene ,Slippage ,Swelling ,medicine.symptom ,0210 nano-technology ,business - Abstract
International audience; 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.
- Published
- 2010
- Full Text
- View/download PDF